ZYGO CORP
S-3/A, 1995-12-08
OPTICAL INSTRUMENTS & LENSES
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    As filed with the Securities and Exchange Commission on December 8, 1995
    
                                                       Registration No. 33-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                ---------------
   
                                AMENDMENT NO. 1
                                       TO
    
                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

                                ---------------

                                ZYGO CORPORATION
             (Exact name of registrant as specified in its charter)

              Delaware                                    06-0864500
    (State or other jurisdiction                       (I.R.S. employer
  of incorporation or organization)                  identification number)

                                Laurel Brook Road
                       Middlefield, Connecticut 06455-0448
                                 (860) 347-8506

    (Address, including zip code, and telephone number, including area code,
                  of registrant's principal executive offices)

                                ---------------

                                 GARY K. WILLIS
                             Chief Executive Officer
                                ZYGO CORPORATION
                                Laurel Brook Road
                       Middlefield, Connecticut 06455-0448
                                 (860) 347-8506

       (Name, address, including zip code, and telephone number, including
                        area code, of agent for service)

                                ---------------

     Copies of all communications, including all communications sent to the
                     agent for service, should be sent to:

            PAUL JACOBS, ESQ.                      HENRY D. KAHN, ESQ.
       FULBRIGHT & JAWORSKI L.L.P.               PIPER & MARBURY L.L.P.
            666 Fifth Avenue                         53 Wall Street
        New York, New York 10103                New York, New York 10005
             (212) 318-3000                          (212) 858-8956

                                ---------------

         Approximate date of commencement of proposed sale to the public: As
  soon as practicable after the effective date of this Registration Statement.

                                ---------------

     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box: [ ]

     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box: [ ]

     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]

     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box: [ ]

                                ---------------
   
    

     The registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the registrant shall
file a further amendment which specifically states that this registration
statement shall thereafter become effective in accordance with section 8(a) of
the Securities Act of 1933 or until the registration statement shall become
effective on such date as the Commission, acting pursuant to said section 8(a),
may determine.

===============================================================================
<PAGE>

                                ZYGO CORPORATION

                              CROSS REFERENCE SHEET

    Pursuant to Item 501(b) of Regulation S-K Showing Location in Prospectus
             of Information Required By Items of Part I of Form S-3

<TABLE>
<CAPTION>

  Item Number and Caption in Form S-3                        Location in Prospectus
  -----------------------------------                        ----------------------

  <S>  <C>                                                   <C>
   1.  Forepart of the Registration Statement
        and Outside Front Cover Page of Prospectus ........  Outside Front Cover Page of Prospectus
   2.  Inside Front and Outside Back Cover   
        Pages of Prospectus ...............................  Inside Front and Outside Back Cover Pages of Prospectus
   3.  Summary Information, Risk Factors and
        Ratio of Earnings to Fixed Charges ................  Cover page; Prospectus Summary; Risk Factors
   4.  Use of Proceeds ....................................  Use of Proceeds
   5.  Determination of Offering Price ....................  Underwriting
   6.  Dilution ...........................................  Not Applicable
   7.  Selling Security Holders ...........................  Principal and Selling Stockholders
   8.  Plan of Distribution ...............................  Outside Front Cover Page of Prospectus; Underwriting
   9.  Description of the Securities to be Registered .....  Not Applicable
  10.  Interest of Named Experts and Counsel ..............  Legal Matters; Experts
  11.  Material Changes ...................................  Not Applicable
  12.  Incorporation of Certain Information
         by References ....................................  Incorporation of Certain Information by Reference
  13.  Disclosure of Commission Position on
         Indemnification for Securities Act Liabilities ...  Not Applicable

</TABLE>

<PAGE>


                                                           Subject to Completion
   
                                                                December 8, 1995
    
                                1,600,000 SHARES

                             ZYGO [logo print style]

                                 ---------------

                                  COMMON STOCK

                                 ---------------


     Of the 1,600,000 shares of Common Stock offered hereby, 845,000 shares are
being sold by Zygo Corporation ("Zygo" or the "Company") and 755,000 shares are
being sold by the Selling Stockholders. The Company will not receive any of the
proceeds from the sale of shares by the Selling Stockholders. See "Principal and
Selling Stockholders."

     The Company's Common Stock is traded on the Nasdaq National Market under
the symbol "ZIGO." On October 26, 1995, the last reported sale price as quoted
on the Nasdaq National Market was $30.00 per share. See "Price Range of Common
Stock."

                                ---------------

         The Common Stock offered hereby involves a high degree of risk.
                     See "Risk Factors" beginning on page 5.

                                ---------------

  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
       EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
      SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
          PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
              REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

<TABLE>
<CAPTION>

=================================================================================================================
                                                 Price         Underwriting       Proceeds         Proceeds
                                                  to           Discounts and         to           to Selling
                                                Public          Commissions      Company(1)      Stockholders
- -----------------------------------------------------------------------------------------------------------------
  <S>                                           <C>              <C>                <C>               <C>

  Per Share ..................................    $                $                 $                 $
  Total(2) ...................................   $               $                  $                 $
=================================================================================================================

(1) Before deducting estimated offering expenses of $       , all of which will
    be paid by the Company.

(2) The Company has granted the Underwriters a 30-day option to purchase up to
    240,000 additional shares of Common Stock solely to cover over-allotments,
    if any. To the extent that the option is exercised, the Underwriters will
    offer the additional shares at the Price to Public shown above. If the
    option is exercised in full, the total Price to Public, Underwriting
    Discounts and Commissions and Proceeds to Company will be $________,
    $________ and $________, respectively. See "Underwriting."

                                ---------------
</TABLE>


     The shares of Common Stock are being offered by the several Underwriters,
subject to prior sale and when, as and if delivered to and accepted by them, and
subject to the right of the Underwriters to reject any order in whole or in
part. It is expected that delivery of the shares of Common Stock will be made at
the offices of Alex. Brown & Sons Incorporated, Baltimore, Maryland, on or about
__________ __, 1995.

   ALEX. BROWN & SONS
       Incorporated

                             NEEDHAM & COMPANY, INC.

                                                                UNTERBERG HARRIS

             The date of this Prospectus is _____________ __, 1995.


     Information contained herein is subject to completion or amendment. A
registration statement relating to these securities has been filed with the
Securities and Exchange Commission. These securities may not be sold nor may
offers to buy be accepted prior to the time the registration statement becomes
effective. This prospectus shall not constitute an offer to sell or the
solicitation of any offer to buy nor shall there be any sale of these securities
in any State in which such offer, solicitation or sale would be unlawful prior
to registration or qualification under the securities laws of any such State.



<PAGE>


                        [DESCRIPTIVE LANGUAGE OF PHOTOS]

                              [Inside Front Cover]

ZYGO [logo print style]

     Zygo instruments are used in a wide variety of industries to measure and
quantify surface shape and roughness of precision products. These measurements
provide critical information for the refinement of the manufacturing process.

(Computer monitor screens depicting the items described by the
following captions:)

Head Geometry--Air bearing surfaces of a two-rail magnetic head measured by the
AAB system.

Material Flatness--Hard disk drive platter measured with a GPI XP.

Material Analysis--extruded aluminum sample measured with a NewView 100.

Sealing Surfaces--Automotive fuel injector seal measured with a GPI XP.

Wear Analysis--Prosthetic implant wear pattern measured with a NewView 100.

                                ---------------

     IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK AT
A LEVEL ABOVE THAT WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN MARKET. SUCH
STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.

     IN CONNECTION WITH THIS OFFERING, CERTAIN UNDERWRITERS AND SELLING GROUP
MEMBERS (IF ANY) OR THEIR RESPECTIVE AFFILIATES MAY ENGAGE IN PASSIVE MARKET
MAKING TRANSACTIONS IN THE COMMON STOCK ON THE NASDAQ NATIONAL MARKET IN
ACCORDANCE WITH RULE 10b-6A UNDER THE SECURITIES EXCHANGE ACT OF 1934.

                                       2

<PAGE>

                           [Left Side Front Fold-Out]

                       Semiconductor OEM & Test Equipment



(Diagram of a Semiconductor Wafer)

(Diagram of a Photolithography Stepper)

(Picture of NewView 100) NewView 100 System measuring a semiconductor wafer.

                           Data Storage Industry


(Diagram of a Hard Disk Media)

(Drawing of a hard disk drive) Typical hard disk drive assembly

(Picture of GPI XP) GPI XP System measuring hard disk media

<PAGE>

                          [Right Side Front Fold-Out]

ZYGO [logo print style]


(Diagram of ZMI 1000 System as used in a photolithography stepper.)


(Diagram of Leadless Chip Carrier)

(Picture of NewView 100) NewView 100 System measuring critical surfaces on 
leadless chip carrier

(Picture of ZMI-1000) ZMI-1000 Distance Measuring Interferometer System

(Picture of AAB System) Automated Air Bearing Inspection System measures 
critical parameters on over 20,000 heads per day.

(Picture of Pegasus 2000) Pegasus 2000 Flying Height Tester

(Diagram of hard disk and magnetic head showing flying height) Flying Height is
the distance between the magnetic head and the spinning hard disk media.

(Picture of glass disk) Zygo also manufactures the ultra-precision glass disks
for the Pegasus 2000 and other flying height testers.


<PAGE>

                               PROSPECTUS SUMMARY

     The following summary is qualified in its entirety by the more detailed
information, including "Risk Factors," and financial statements and notes
thereto appearing elsewhere in this Prospectus.

                                   The Company

     Zygo designs, develops, manufactures and markets high performance,
noncontact electro-optical measuring instruments, systems and accessories, as
well as optical components to precise tolerances both for sale and for use as
key elements in its own products. Utilizing proprietary laser and optics
technology combined with advanced software and electronics, the Company's
precision noncontact measuring instruments enable manufacturers in a variety of
industries, including data storage, semiconductor and precision optics, to
increase operating efficiencies and product yields by identifying and collecting
quantitative data on product defects, both during and after the manufacturing
process. Zygo's precision optical components are used in many applications,
including laser fusion research, semiconductor manufacturing equipment and
aerospace optical systems, and are an integral part of precision optical
instruments.

     Predominantly all of the Company's instruments, systems and accessories
employ either a laser or white light source to make noncontact measurements.
Through a process called interferometry, a pattern of bright and dark lines
(called fringes) results from an optical path difference between a reference and
a measurement beam. Zygo's products then analyze these patterns through a series
of steps and generate quantitative three-dimensional surface profiles, which are
used to determine the conformity of a part to its specifications, to detect
product defects and, increasingly, to analyze and enhance manufacturing
processes.

     Interferometric measurement instruments are used by a variety of
industries, including the data storage industry to inspect and analyze the
surface of computer hard disks and read/write heads, and the semiconductor
industry for high precision distance measurement and motion control. The overall
growth in high technology industries, such as data storage and semiconductor,
combined with the need of manufacturers in those industries to produce more
powerful and smaller products with more precise tolerances, has fueled demand
for precision measuring instruments such as those produced by the Company. This
trend towards miniaturization creates new challenges for manufacturers as they
are forced to handle, measure and test ever smaller components. In addition,
with competitive pressures to improve productivity, the Company believes these
industries are focusing greater attention on the need to reduce production
defects and significantly increase production yields. By working with leading
companies within these industries to transfer its measurement technologies from
off-line inspection applications to on-the-production-line process control
applications, the Company has developed instrumentation with the throughput,
reliability and information delivery capabilities necessary to meet the
production requirements of these industries.

     The Company sells its products worldwide to leading manufacturers in the
semiconductor, data storage and optics industries, including Canon, ETEC,
Motorola, SVG, Texas Instruments, Akashic, Applied Magnetics, Conner
Peripherals, Komag, Read-Rite, Seagate, Bausch & Lomb, Corning and Vistakon. In
fiscal 1995, net sales to the Company's two largest customers, including Canon,
accounted for 46.8% of the Company's net sales.

     The Company's business strategy is to: (1) continue to integrate
proprietary electro-optical technologies, including optical interferometry and
other forms of optical metrology, precision optical component fabrication and
coating, application software engineering and system integration engineering to
provide leading edge automated optical inspection solutions; (2) seek to adapt
precision noncontact inspection and process control technologies for new markets
where Zygo perceives the opportunity to become a market leader; (3) broaden
relationships with its leading customers to develop new applications for the
Company's technologies; (4) deliver high quality and high reliability system
solutions in a minimal cycle time; (5) provide uninterrupted worldwide customer
service and support; and (6) broaden its product offerings through internal
development and selective synergistic acquisitions.
   
     The Company was incorporated in 1970 under the laws of the State of
Delaware. Unless the context otherwise requires, references in this Prospectus
to "Zygo" and the "Company" refer to Zygo Corporation and its wholly owned
subsidiaries. The Company's principal offices are located at Laurel Brook Road,
Middlefield, Connecticut 06455-0448, and its telephone number is (860) 347-8506.
    
                                       3
<PAGE>


                                  The Offering

<TABLE>
<S>                                                           <C>

Common Stock offered by the Company .......................     845,000 shares

Common Stock offered by the Selling Stockholders ..........     755,000 shares 
   
Common Stock to be outstanding after the offering .........   4,778,886 shares (1)

Use of proceeds to the Company ............................   For working capital associated with
                                                              expanded sales, research and development
                                                              and other general corporate purposes, and
                                                              for possible acquisitions. See "Use of
                                                              Proceeds."

Nasdaq National Market symbol .............................   ZIGO
    
</TABLE>


                     Summary of Consolidated Financial Data
                      (In thousands, except per share data)

<TABLE>
<CAPTION>

                                                                                                Three Months
                                                  Fiscal Year Ended June 30,                    Ended Sept. 30,
                                      ---------------------------------------------------      -----------------
                                      1991        1992       1993        1994        1995       1994        1995
                                      ----        ----       ----        ----        ----      -----        ----

<S>                                 <C>         <C>        <C>         <C>         <C>         <C>        <C>

Statement of Earnings Data:
   Net sales ...................... $30,425     $26,744    $22,702     $24,141     $32,233     $5,858     $11,341
   Gross profit ...................  11,562      10,224      9,049      10,616      14,231      2,404       5,004
   Operating profit (loss) ........   1,841         822        (26)      1,155       3,727        235       1,618
   Net earnings ...................   1,261         632        481         918       2,749        156       1,090
   Earnings per common and
    common equivalent share .......  $ 0.33     $  0.16    $  0.12     $  0.23     $  0.65     $ 0.04     $  0.23
   Weighted average common
    shares and common
    dilutive equivalents
    outstanding ...................   3,779       3,900      3,902       3,987       4,242      3,971       4,670

</TABLE>




                                                    September 30, 1995
                                               ----------------------------
                                                Actual        As Adjusted(2)
                                               -------        -------------
Balance Sheet Data:

  Working capital ...........................  $18,032          $41,499
  Total assets ..............................   30,767           54,234
  Long-term debt, excluding current
    portion .................................      -0-              -0-
  Stockholders' equity ......................   23,443           46,910




- ----------
(1)    Based upon the number of shares outstanding as of September 30, 1995.
       Does not include 870,387 shares issuable upon the exercise of options
       outstanding under the Company's stock option plans as of such date.

(2)    Adjusted to reflect the sale of 845,000 shares offered by the Company
       hereby and the anticipated application of the estimated net proceeds
       therefrom. See "Use of Proceeds."

     Except as otherwise indicated, all information contained in this Prospectus
(i) has been retroactively adjusted to give effect to (a) a 3-for-2 stock split
effected in the form of a 50% stock dividend paid on August 21, 1995 to
stockholders of record on August 1, 1995 (the "Stock Split") and (b) increases
in the number of shares of Common Stock authorized by the Company's Certificate
of Incorporation from 10,000,000 to 15,000,000 shares and in the number of
shares of Common Stock that may be issued under the Company's Amended and
Restated Non- Qualified Stock Option Plan from 975,000 shares to 1,425,000
shares, both of which increases have been approved by the Board of Directors and
are to be voted on at the annual meeting of stockholders to be held on November
16, 1995, and (ii) assumes (a) a public offering price of $30.00 per share (the
last reported sales price of the Company's common stock on the Nasdaq National
Market on October 26, 1995) and (b) that the Underwriters' over-allotment option
will not be exercised. See "Underwriting." As used herein, a "fiscal year" means
a year ending June 30.

                                       4
<PAGE>

                                  RISK FACTORS

     In addition to the other information in this Prospectus, the following
factors should be considered carefully in evaluating an investment in the shares
of Common Stock offered by this Prospectus.
   
     Customer Concentration; Relationship with Canon. Sales to the Company's two
largest customers in fiscal 1995 and fiscal 1994 accounted for an aggregate of
46.8% and 41.2% of net sales, respectively. During these fiscal years, sales to
Canon Inc. and Canon Sales Co., Inc. (collectively, "Canon"), the Company's
largest customer in those periods, accounted for 29.6% and 32.1%, respectively,
of the Company's net sales. The Company expects that sales to Canon, an original
investor in the Company which prior to this offering owns 20.0% of the
Company's Common Stock and is the Company's exclusive distributor for sales of
the Company's products in the Japanese market, will continue to represent a
significant percentage of the Company's net sales for the foreseeable future.
During fiscal 1995, sales to Seagate Technology, Inc. ("Seagate"), a
manufacturer of computer disk drives and related hardware and software,
accounted for approximately 17.2% of the Company's net sales; sales to Seagate
were insignificant in fiscal 1994. The Company's customers generally do not
enter into long-term agreements obligating them to purchase the Company's
products. A reduction or delay in orders from either of these two customers,
including reductions or delays due to market, economic, or competitive
conditions in the semiconductor or computer disk drive industries, could have a
material adverse effect upon the Company's results of operations. See
"Business--Markets and Customers" and Note 10 to the Consolidated Financial
Statements included elsewhere in this Prospectus.
    
     Quarterly Fluctuations. The Company has experienced quarterly fluctuations
in results of operations and anticipates that these fluctuations may continue.
These fluctuations have been caused by various factors, including the capital
procurement practices of its customers and the industries into which its
products are sold generally, the timing and acceptance of new product
introductions and enhancements and the timing of product shipments and
marketing. Future results of operations may fluctuate as a result of these and
other factors, including the Company's ability to continue to develop innovative
products, the announcement or introduction of new products by the Company's
competitors, the Company's product and customer mix, the level of competition
and overall trends in the economy. See "Management's Discussion and Analysis of
Results of Operations and Financial Condition-- Quarterly Comparisons."

     Industry Concentration and Cyclicality. The Company's business is
significantly dependent on capital expenditures by manufacturers of components
for the computer disk drive industry and of semiconductors. These industries are
cyclical and have historically experienced periods of oversupply, resulting in
significantly reduced demand for capital equipment, including the products
manufactured and marketed by the Company. For the foreseeable future, the
Company's operations will continue to be dependent on the capital expenditures
in these industries which, in turn, is largely dependent on the market demand
for hard disk drives and products containing integrated circuits. The Company's
net sales and results of operations may be materially adversely affected if
downturns or slowdowns in the computer disk drive or semiconductor markets occur
in the future.

     Technological Change and New Product Development. The market for the
Company's products is characterized by rapidly changing technology. The
Company's future success will continue to depend upon its ability to enhance its
current products and to develop and introduce new products that keep pace with
technological developments and evolving industry standards, respond to changes
in customer requirements and achieve market acceptance. Over the past three
years, the Company has redesigned and enhanced all of its instrument products
and upgraded its proprietary software incorporated in certain of its
instruments. Any failure by the Company to anticipate or respond adequately to
technological developments and customer requirements, or any significant delays
in product development or introduction, could have a material adverse effect on
the Company's business, results of operations, financial condition and
liquidity. In order to develop new products successfully, the Company is
dependent upon close relationships with its customers and their willingness to
share proprietary information about their requirements and participate in
collaborative efforts with the Company. There can be no assurance that the
Company's customers will continue to provide it with timely access to such
information or that the Company will be successful in developing and marketing
new products and services or product and service enhancements on a timely basis
and respond effectively to technological changes or new product announcements by
others. In addition, there can be no assurance the new products and services or
product and service enhancements, if any, developed by the Company will achieve
market acceptance. See "Business--Zygo Strategy" and "--Research, Development
and Engineering."

     Dependence on Proprietary Technology. The Company's success is heavily
dependent upon its proprietary technology. There can be no assurance that the
steps taken by the Company to protect its proprietary technology will

                                       5

<PAGE>

be adequate to prevent misappropriation of its technology by third parties
or will be adequate under the laws of some foreign countries, which may not
protect the Company's proprietary rights to the same extent as do laws of the
United States. In addition, there remains the possibility that others will
"reverse engineer" the Company's products in order to determine their method of
operation and introduce competing products or that others will develop competing
technology independently. Any such adverse circumstances could have a material
adverse effect on the Company's results of operations. Further, some of the
markets in which the Company competes are characterized by the existence of a
large number of patents and frequent litigation for financial gain that is based
on patents with broad, and often questionable, application. As the number of its
products increase, the markets in which its products are sold expands, and the
functionality of those products grows and overlaps with products offered by
competitors, the Company believes that it may become increasingly subject to
infringement claims. Although the Company does not believe any of its products
or proprietary rights infringe the rights of third parties, there can be no
assurances that infringement claims will not be asserted against the Company in
the future or that any such claims will not require the Company to enter into
royalty arrangements or result in costly litigation. See "Business--Patents and
Other Intellectual Property Rights."

     Management of Growth; Risks Associated with Potential Acquisitions. The
Company is currently experiencing a period of rapid growth, attributable in
large part to new product introductions. This growth expansion has placed and
could continue to place a significant strain on the Company's personnel and
other resources. The Company's recent growth, which might accelerate in the
event the Company undertakes a significant acquisition, has resulted in an
increased level of responsibility for the Company's management personnel.
Certain of the Company's management personnel have had limited or no experience
in managing companies as large as or larger than the Company. The Company's
ability to manage growth effectively will require the Company to continue to
improve its operational, management and financial systems and controls and to
successfully train, motivate and manage its employees. If the Company's
management is unable to manage growth effectively, the Company's business,
results of operations, financial condition and liquidity could be materially and
adversely affected.

     While there are currently no commitments with respect to any future
acquisitions, the Company's business strategy includes the expansion of its
products and services, which may be effected through acquisitions. The Company
regularly reviews various acquisition prospects of businesses, technologies or
products complementary to the Company's business and periodically engages in
discussions regarding such possible acquisitions. Acquisitions involve numerous
risks, including difficulties in the assimilation of the operations and products
of the acquired companies, the ability to manage effectively geographically
remote units, the diversion of management's attention from other business
concerns, risks of entering markets in which the Company has limited or no
direct experience and the potential loss of key employees of the acquired
companies. In addition, acquisitions may result in dilutive issuances of equity
securities, the incurrence of debt, reduction of existing cash balances,
amortization expenses related to goodwill and other intangible assets and other
charges to operations that may materially adversely affect the Company's
business, financial condition or results of operations. Although management
expects to carefully analyze any such opportunity before committing the
Company's resources, there can be no assurance that any acquisition will result
in long-term benefits to the Company or that Zygo's management will be able to
manage effectively the resulting businesses. See "Business--Zygo Strategy."

     Competition. The Company faces competition from a number of companies in
all its markets, some of which competitors have greater manufacturing and
marketing capabilities, and greater financial, technological and personnel
resources. In addition, the Company competes with the internal development
efforts of its current and prospective customers, certain of which may attempt
to become vertically integrated. The Company's competitors can be expected to
continue to improve the design and performance of their products and to
introduce new products with competitive price/performance characteristics.
Competitive pressures often necessitate price reductions which can adversely
affect results of operations. Although the Company believes that it has certain
technical and other advantages over certain of its competitors, maintaining such
advantages will require a continued high level of investment by the Company in
research and development and sales, marketing and service. There can be no
assurance that the Company will have sufficient resources to continue to make
such investment or that the Company will be able to make the technological
advances necessary to maintain such competitive advantages. In addition, there
can be no assurance that the bases of competition in the industries in which the
Company competes will not shift. See "Business--Competition."

                                       6

<PAGE>

     Possible Volatility of Stock Price. The Company believes that factors such
as the announcement of new products or technologies by the Company or its
competitors, market conditions in the precision measurement, data storage and
semiconductor industries generally and quarterly fluctuations in financial
results are expected to cause the market price of the Common Stock to vary
substantially. Further, the Company's net sales or results of operations in
future quarters may be below the expectations of public market securities
analysts and investors. In such event, the price of the Company's Common Stock
would likely decline, perhaps substantially. In addition, in recent years the
stock market has experienced price and volume fluctuations that have
particularly affected the market prices for many high technology companies and
which often have been unrelated to the operating performance of such companies.
The market volatility may adversely affect the market price of the Company's
Common Stock. See "Price Range of Common Stock."

     Dependence on Key Personnel. Zygo's success depends in large part upon the
continued services of many of its highly skilled personnel involved in
management, research, development and engineering, and sales and marketing, and
upon its ability to attract and retain additional highly qualified employees.
The Company's employees may voluntarily terminate their employment with the
Company at any time. Competition for such personnel is intense, and there can be
no assurance that the Company will be successful in retaining its existing
personnel or attracting and retaining additional personnel.

     Dependence on Third-Party Suppliers. Certain of the components and
subassemblies included in the Company's systems are obtained from a single
source or a limited group of suppliers. Although the Company seeks to reduce
dependence on sole and limited source suppliers in some cases, the partial or
complete loss of certain of these sources could have at least a temporary
adverse effect on the Company's results of operations and damage customer
relationships. See "Business--Manufacturing."

     Revenues Derived from International Sales and Foreign Operations. The
Company's products are sold internationally by the Company primarily to
customers in Japan. Net sales to customers outside the United States accounted
for 46.5% and 45.7% of the Company's net sales in the fiscal years ended June
30, 1995 and 1994, respectively, and are expected to continue to account for a
substantial percentage of the Company's net sales. International sales and
foreign operations are subject to inherent risks, including longer payment
cycles, greater difficulty in accounts receivable collection, compliance with
foreign laws, changes in regulatory requirements, tariffs or other barriers,
difficulties in obtaining export licenses and in staffing and managing foreign
operations, exposure to currency exchange fluctuations, political instability,
transportation delays and potentially adverse tax consequences. Substantially
all the Company's sales and costs are negotiated and paid in U.S. dollars.
However, changes in the values of foreign currencies relative to the value of
the U.S. dollar can render the Company's products comparatively more expensive,
to the extent locally produced alternative products are available. Such
conditions could negatively impact international sales of the Company's products
and the Company's foreign operations, as would changes in the general economic
conditions in those markets. Although these risks, including the risks
associated with currency exchange fluctuations, have not had any material
adverse effect on the Company to date, there can be no assurance that risks
inherent in international sales and foreign operations will not have a material
adverse effect on the Company in the future. See "Business--Sales, Marketing and
Customer Support."

     Reliance on Sole Manufacturing Facility. The Company manufactures all of
its products at its facility in Middlefield, Connecticut. Any extended
interruption of optical component production at the Company's manufacturing
facility could have a material adverse effect on the business of the Company.

     Control of Company. Upon completion of this offering, the Company's
executive officers and directors, through their affiliation with certain
stockholders, may be deemed to beneficially own approximately 26.4% of the
outstanding shares of Common Stock. As a result, these individuals may have the
ability to control the Company and direct its affairs and business, including
the election of all of the directors. See "Management" and "Principal and
Selling Stockholders."

     Dividend Policy. The Company has never declared or paid cash dividends on
its capital stock. The Company currently intends to retain all its earnings to
finance the expansion and development of its business and, therefore, does not
anticipate paying any cash dividends in the foreseeable future. See "Dividend
Policy."

                                       7

<PAGE>

                                 USE OF PROCEEDS

     The net proceeds to the Company from the sale of the shares of Common Stock
offered by the Company hereby are estimated to be approximately $23.5 million.
The Company intends to use its net proceeds for working capital associated with
expanded sales, research and development and other general corporate purposes.
In addition, the net proceeds to the Company may be used for future
acquisitions. The Company regularly reviews various acquisition prospects of
businesses, technologies or products complementary to the Company's business and
periodically engages in discussions regarding such possible acquisitions.
Currently, the Company is not a party to any agreements or understandings
regarding any material acquisitions; however, as the result of Zygo's process of
reviewing possible acquisition prospects, negotiations may occur from time to
time if appropriate opportunities arise. Pending such uses, the net proceeds are
expected to be invested in short-term, investment grade or U.S. government
securities.

     The Company will not receive any proceeds from the sale of shares of Common
Stock by the Selling Stockholders. See "Principal and Selling Stockholders."

                           PRICE RANGE OF COMMON STOCK

     The Common Stock is quoted on the Nasdaq National Market under the symbol
ZIGO. The following table sets forth, for the periods indicated, high and low
last reported sale prices for the Common Stock on the Nasdaq National Market.
All last sale prices for periods prior to August 21, 1995, the date upon which
the Stock Split was effected, have been divided by 1.5, the assumed effect of
the Stock Split.

                                                         High        Low
                                                         ----        ---
     Year ended June 30, 1994:
       First quarter ................................  $ 4.83      $ 3.83
       Second quarter ...............................    5.17        4.17
       Third quarter ................................    5.67        4.83
       Fourth quarter ...............................    5.17        4.00

     Year ended June 30, 1995:
       First quarter ................................  $ 4.67      $ 3.75
       Second quarter ...............................    5.33        4.33
       Third quarter ................................   11.83        4.67
       Fourth quarter ...............................   24.17       10.33
   
     Year ended June 30, 1996:
       First quarter ................................   $29.25     $20.67
       Second quarter (through December 7, 1995) ....    34.25      27.75

     As of September 30, 1995, there were 481 holders of record of the Common
Stock and the Company estimates that there were approximately 1,850 beneficial
holders. The last reported sale price of the Common Stock on the Nasdaq National
Market on December 7, 1995 was $31.75.
    
                                 DIVIDEND POLICY

     The Company has never declared or paid any cash dividends on its Common
Stock. The Company anticipates that all future earnings will be retained by the
Company for the development of its business. Accordingly, the Company does not
anticipate paying cash dividends on the Common Stock in the foreseeable future.
The payment of any future dividends will be at the discretion of the Company's
Board of Directors and will depend upon, among other things, future earnings,
operations, capital requirements, the general financial condition of the Company
and general business conditions.

                                       8
<PAGE>

                                 CAPITALIZATION

     The following table sets forth the capitalization of the Company as of
September 30, 1995 and as adjusted to reflect the sale by the Company of 845,000
shares of Common Stock pursuant to this offering and the anticipated use of the
estimated net proceeds to the Company therefrom.

<TABLE>
<CAPTION>

                                                                                        September 30, 1995
                                                                                       ---------------------
                                                                                       Actual    As Adjusted
                                                                                       ------    -----------
                                                                                          (In thousands)
<S>                                                                                    <C>         <C>
        Long-term debt, excluding current portion ..................................  $    -0-     $   -0-
        Stockholders' equity:
        Common Stock:
          $0.10 par value, 15,000,000 shares authorized, 4,037,686 shares
          issued actual; and 4,882,686 shares issued as adjusted (1) ...............       404         488
        Additional paid-in capital .................................................    10,748      34,131
        Retained earnings ..........................................................    12,598      12,598
        Net unrealized loss on marketable securities ...............................        (6)         (6)
                                                                                       -------     -------
        Less treasury stock, at cost; 103,800 shares ...............................       301         301
          Total stockholders' equity ...............................................    23,443      46,910
                                                                                       -------     -------
              Total capitalization .................................................   $23,443     $46,910
                                                                                       =======     =======

- ----------
(1)  Does not include 870,387 shares issuable upon the exercise of options
     outstanding under the Company's stock option plans as of such date. See
     Note 8 to the Consolidated Financial Statements included elsewhere in this
     Prospectus.

</TABLE>

                                       9
<PAGE>

                      SELECTED CONSOLIDATED FINANCIAL DATA

                    (In thousands, except per share amounts)

     The selected consolidated financial data presented below for, and as of
each of the years in the five-year period ended June 30, 1995, have been derived
from the consolidated financial statements of the Company, which have been
audited by KPMG Peat Marwick LLP, independent certified public accountants. The
selected consolidated financial data presented below as of September 30, 1995
and for the three-month periods ended September 30, 1994 and September 30, 1995
have been derived from unaudited consolidated financial statements of the
Company. In the opinion of management, the unaudited interim financial
information has been prepared on the same basis as the audited consolidated
financial statements and includes all adjustments, consisting of only normal
recurring adjustments, necessary to state fairly the information set forth
therein. Such interim results are not necessarily indicative of future results
of operations. This selected consolidated financial data should be read in
conjunction with "Management's Discussion and Analysis of Results of Operations
and Financial Condition" and with the Company's Consolidated Financial
Statements and footnotes which are included elsewhere in this Prospectus.

<TABLE>
<CAPTION>

                                                                                                              Three Months
                                                               Fiscal Year Ended June 30,                    Ended Sept. 30,
                                                 -----------------------------------------------------       ----------------
                                                   1991        1992       1993        1994        1995       1994       1995
                                                  ------      ------     ------      ------      ------     ------     ------
<S>                                              <C>         <C>        <C>         <C>         <C>         <C>        <C>
Statements of Earnings Data:
Net sales ....................................   $30,425     $26,744    $22,702     $24,141     $32,233     $5,858     $11,341
Cost of goods sold ...........................    18,863      16,520     13,653      13,525      18,002      3,454       6,337
                                                 -------     -------    -------     -------     -------     ------     -------
    Gross profit .............................    11,562      10,224      9,049      10,616      14,231      2,404       5,004
Selling, general and administrative
  expenses ...................................     6,662       6,347      5,998       6,675       6,537      1,500       1,960
Research, development and
  engineering expenses .......................     3,059       3,447      3,077       2,786       3,967        669       1,426
Restructuring (profit)(1) ....................       -0-       (392)       -0-         -0-         -0-        -0-          -0-
                                                 -------     -------    -------     -------     -------     ------     -------
    Operating profit (loss) ..................     1,841         822        (26)      1,155       3,727        235       1,618
                                                 -------     -------    -------     -------     -------     ------     -------
Other income (expense):
  Interest income ............................       350         285        379         338         372         88         101
  Interest expense ...........................      (116)       (106)       (69)        (51)        (40)       (12)        -0-
  Miscellaneous income
    (expense), net ...........................       (83)        (48)       414        (114)       (103)       (63)        (41)
                                                 -------     -------    -------     -------     -------     ------     -------
    Total other income .......................       151         131        724         173         229         13          60
                                                 -------     -------    -------     -------     -------     ------     -------
    Earnings before income
     taxes ...................................     1,992         953        698       1,328       3,956        248       1,678
Income tax expense ...........................       731         321        217         410       1,207         92         588
                                                 -------     -------    -------     -------     -------     ------     -------
Net earnings .................................   $ 1,261     $   632    $   481     $   918     $ 2,749     $  156     $ 1,090
                                                 =======     =======    =======     =======     =======     ======     =======
Earnings per common and
   common equivalent share ...................   $  0.33     $  0.16    $  0.12     $  0.23     $  0.65     $ 0.04     $  0.23
                                                 =======     =======    =======     =======     =======     ======     =======
Weighted average common
   shares and common
   dilutive equivalents
   outstanding ...............................     3,779       3,900      3,902       3,987       4,242      3,971       4,670
                                                 =======     =======    =======     =======     =======     ======     =======

</TABLE>

<TABLE>
<CAPTION>
                                                                         June 30,                               September 30,
                                                   ---------------------------------------------------          ------------
                                                   1991        1992       1993        1994        1995             1995
                                                  ------      ------     ------      ------      ------           ------
<S>                                              <C>         <C>        <C>         <C>         <C>              <C>
Balance Sheet Data:

Working capital ...............................  $12,313     $13,388    $14,648     $14,889     $17,072          $18,032
Total assets ..................................   23,106      23,645     24,555      24,499      29,666           30,767
Long-term debt, excluding current
  portion .....................................    1,140         878        613         481         -0-              -0-
Stockholders' equity ..........................   16,765      17,720     18,416      19,274      22,333           23,443
<FN>
- ------------
(1)  Represents a gain from restructuring as a result of the sale of the IMAGE Product Line in June 1992.
</FN>
</TABLE>

                                       10


<PAGE>


                     MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  RESULTS OF OPERATIONS AND FINANCIAL CONDITION

     The following discussion provides a summary analysis of the Company's
results of operations and financial condition and should be read in conjunction
with the "Selected Consolidated Financial Data" and the Consolidated Financial
Statements and Notes thereto included elsewhere in this Prospectus.

Overview

     The Company was founded in 1970 to produce high precision plano (flat)
optical components to customer specifications for a wide variety of uses. In
1971 the Company constructed its plano optical fabrication facility. The Company
introduced its first interferometer in 1972 for the inspection of its own
optical components. As the Company grew it developed into a leading supplier of
high performance, noncontact electro-optical measuring instruments and
accessories while maintaining its leadership status in its custom optical
components business.

     Since early in calendar 1992, under the direction of a new management team,
the Company has focused its attention in three principal areas: (i)
restructuring the Company, including a substantial downsizing of its workforce,
the sale of an unprofitable product line and the replacement of all of its
instrument products; (ii) introducing a "Total Quality Process" focused on
improving the quality, responsiveness, and productivity of the Company resulting
in improved financial performance; and (iii) refocusing its marketing and
product development to provide production control and yield management
instruments and systems, which can be used in the on-line production
environment, while continuing to provide the Company's traditional surface
analysis products used in off-line quality control or laboratory environments.

     As a result of significant new product introductions over the last three
fiscal years, net sales of the Company's instruments, systems and accessories
accounted for an increasing percentage of the Company's overall net sales
(73.4%, 77.6% and 84.2% of net sales in fiscal years 1993, 1994 and 1995,
respectively). This trend is expected to continue in the immediate future.

Results of Operations

     For the periods indicated, the following table sets forth the percentage of
net sales represented by the respective line items in the Company's consolidated
statement of earnings and the percentage increase (decrease) from the previous
period's results.

<TABLE>
<CAPTION>

                                            Percentage of Revenues                   Percentage Increase (Decrease)
                                -----------------------------------------------    ---------------------------------
                                                                 Three Months                          Three Months
                                    Fiscal Year Ended                Ended         Fiscal Year Ended       Ended
                                        June 30,                 September 30,         June 30,         September 30,
                                --------------------------     ----------------    -----------------   -------------
                                                                                     1993      1994        1994
                                 1993       1994      1995      1994       1995     to 1994   to 1995     to 1995
                                ------     ------    ------    ------     ------   -------   -------     -------
<S>                             <C>        <C>       <C>       <C>        <C>       <C>       <C>         <C>
Net sales ....................  100.0%     100.0%    100.0%    100.0%     100.0%     6.3%      33.5%       93.6%
Gross profit .................   39.9       44.0      44.2      41.0       44.1     17.3       34.1       108.2
Selling, general and
  administrative expenses ....   26.4       27.7      20.3      25.6       17.3     11.3       (2.1)       30.7
Research, development and
  engineering expenses .......   13.6       11.5      12.3      11.4       12.6     (9.5)      42.4       113.2
Operating profit .............   (0.1)       4.8      11.6       4.0       14.3      --       222.7       588.5
Net earnings .................    2.1        3.8       8.5       2.7        9.6     90.9      199.5       598.7

</TABLE>

                                       11

<PAGE>

  Three Months Ended September 30, 1995 Compared to Three Months Ended
  September 30, 1994

     Net Sales. Net sales for the three months ended September 30, 1995 amounted
to $11.3 million, an increase from net sales in the comparable period in 1994 by
$5.5 million or 93.6%. The increase was primarily attributable to an increase of
134.8% in net sales of the Company's electro-optical instruments in the three
months ended September 30, 1995 from the comparable prior year period,
principally as a result of demand from manufacturers of data storage and
semiconductor products. The increase in net sales was also positively impacted
by higher service revenues, partially offset by lower sales of precision optical
components.

     Gross Profit. Gross profit for the three months ended September 30, 1995
amounted to $5.0 million, an increase of $2.6 million from gross profit of $2.4
million for the comparable prior year period. For the three months ended
September 30, 1995, gross profit as a percentage of sales amounted to 44.1%, an
increase of 3.1 percentage points from gross profit as a percentage of sales of
41.0% for the comparable prior year period. These increases primarily resulted
from substantially higher sales volumes of the Company's electro-optical
instrument products, which have higher average gross profit margins than the
Company's precision optical components, as well as volume-related manufacturing
efficiencies.

     Selling, General and Administrative Expenses. Selling, general and
administrative expenses in the three months ended September 30, 1995 amounted to
$2.0 million, an increase of $460,000 from $1.5 million in the three months
ended September 30, 1994. This increase was primarily due to an increase in
volume-related expenses, such as commissions paid to the Company's direct sales
personnel and external sales agents. As a percentage of sales, selling, general
and administrative expenses declined in the three months ended September 30,
1995 to 17.3% as compared to 25.6% in the comparable prior year period.

     Research, Development and Engineering Expenses. Research, development and
engineering ("R&D") expenses in the three months ended September 30, 1995
totaled $1.4 million or 12.6% of sales as compared to $669,000 or 11.4% of sales
in the comparable prior year period. The significant increase in R&D expenses
primarily resulted from spending on personnel and materials at the Company's R&D
facility in Simi Valley, California, which was formed in the quarter ended March
31, 1995. This R&D facility, in conjunction with the Company's Middlefield,
Connecticut personnel, introduced the Pegasus 2000 Flying Height
Tester in September 1995.

     Operating Profit. Operating profit in the three months ended September 30,
1995 was $1.6 million and increased by $1.4 million or 588.5% from the
comparable three-month period in the year earlier. Higher sales volume coupled
with improved gross profit margins, partially offset by higher selling expenses
and higher R&D expenses were the primary factors leading to the record operating
profitability in the three-month period ended September 30, 1995.

     The Company's backlog increased by 151.7% in the quarter ended September
30, 1995 to $14.0 million from $5.6 million at September 30, 1994. This record
level of backlog was an increase of $1.0 million or 7.7% from the backlog at
June 30, 1995. Significant new orders for the Company's electro-optical
instruments, systems and accessories was the principal reason for the increase
in the backlog from the prior year period.

  Fiscal 1995 Compared to Fiscal 1994

     Net Sales. Net sales of $32.2 million for fiscal 1995 increased from fiscal
1994 sales by $8.1 million or 33.5%. The principal reason for the significant
increase was additional sales of the Company's electro-optical instrument
products primarily resulting from an improved economic climate in certain
industry segments, most notably semiconductor and data storage (disk drive)
manufacturing, and from the introduction of a new fully-automated
electro-optical instrument product which is used by data storage industry
customers to improve the yield of their manufacturing processes. These increases
were partially offset by a decline of $340,000 in R&D contract revenues
resulting from the completion in fiscal 1994 of an R&D contract and lower sales
of the Company's precision custom optical components, which declined by $313,000
or 5.8% from the year earlier.

     The Company's sales outside the United States amounted to $15.0 million in
fiscal 1995, an increase of $3.9 million from fiscal 1994. Sales in Japan during
fiscal 1995 amounted to $9.6 million, an increase of $2.0 million over fiscal
1994. This increase resulted primarily from an increase in product sales in
Japan in fiscal 1995 of 32.9% when compared to product sales in fiscal 1994,
partially offset by the absence in fiscal 1995 of R&D contract revenues. The

                                       12

<PAGE>

significant increase in product sales was primarily due to the improving
Japanese economy and the strengthening of the semiconductor equipment market
served by Canon, the Company's exclusive distributor in Japan. Sales to other
geographic markets outside the U.S. amounted to $5.4 million in fiscal 1995, a
$1.9 million increase from fiscal 1994. The 54.6% increase was principally the
result of strong sales of the Company's electro-optical instruments to the data
storage and semiconductor manufacturing industry in the Pacific Rim and
increased sales in Europe as a result of an improved general economic climate
there.

     Gross Profit. Gross profit in fiscal 1995 amounted to $14.2 million, an
increase of $3.6 million (34.1%) over gross profit in fiscal 1994, principally
due to the increase in sales and a slight improvement in gross profit margins on
actual shipments. As a percentage of sales, gross profit in fiscal 1995 was
44.2%, as compared to 44.0% in fiscal 1994.

     Selling, General and Administrative Expenses. Selling, general and
administrative expenses in fiscal 1995 decreased by $138,000 from fiscal 1994.
As a percentage of sales, selling, general and administrative expenses were
20.3% and 27.7% in fiscal 1995 and fiscal 1994, respectively. Selling expenses,
including salaries, advertising, and sales promotion expenses related to the
Company's electro-optical instrument products as well as commissions on higher
sales, increased $307,000 from fiscal 1994. Administrative expenses decreased by
$445,000 principally as a result of reduced legal expenses incurred in
connection with the Company's litigation against WYKO Corporation for patent
infringement, currently pending appeal, the status of which is discussed below
in the Liquidity and Capital Resources section. Additional administrative cost
reductions reflect the completion of the implementation of a new Business
Management Information System and continued strict cost controls.
   
     Research, Development and Engineering Expenses. R&D expenses in fiscal 1995
totaled $4.0 million and increased by $1.2 million or 42.4% from fiscal 1994.
The increase was principally the result of spending associated with the creation
and operation of an R&D facility in Simi Valley, California, which is focused on
designing and developing production-oriented test and measurement products for
the data storage industry. The first product developed there is the Pegasus
2000, a flying height tester. Additionally, the amount of expense incurred in
fiscal 1995 at the Company's Middlefield, Connecticut facility increased from
fiscal 1994 to support several R&D projects underway there. As a percentage of
sales, research and development costs were 12.3% and 11.5% in fiscal 1995 and
fiscal 1994, respectively.
    
     Operating Profit. In fiscal 1995, the Company had operating profit of $3.7
million (11.6% of net sales) as compared to $1.2 million (4.8% of net sales) in
fiscal 1994. The 222.7% improvement resulted principally from higher gross
profit from increased sales volume, partially offset by the increase in R&D
expense.

     Other Income (Expense). Interest income in fiscal 1995 amounted to $372,000
and was $34,000 higher than fiscal 1994, principally due to generally higher
interest rates on the Company's marketable securities and short-term cash
investments. Interest expense decreased in fiscal 1995 by $11,000 from $51,000
in fiscal 1994 primarily as the result of lower average principal balances on
the Company's long-term debt, which was fully repaid in the quarter ended March
31, 1995.

  Fiscal 1994 Compared to Fiscal 1993

     Net Sales. Net sales of $24.1 million for fiscal 1994 increased from fiscal
1993 sales by $1.4 million or 6.3%. The principal reason for the increase was
additional sales of the Company's electro-optical instrument products primarily
resulting from an improved economic climate in certain industry segments and the
introduction of several new electro-optical instrument products which totally
replaced the Company's electro-optical instrument product line. These increases
were partially offset by a decline of $1.0 million in R&D contract revenues and
lower sales of the Company's precision custom optical components due to the
culmination of a significant contract from the University of Rochester for its
laser fusion programs.

     The Company's sales outside the United States amounted to $11.0 million in
fiscal 1994, an increase of $2.4 million from fiscal 1993. Sales in Japan during
fiscal 1994 amounted to $7.6 million, an increase of $2.9 million over fiscal
1993, which occurred despite the decline in fiscal 1994 of R&D contract
revenues. Product sales in Japan increased in fiscal 1994 by over 100.0% when
compared to product sales in fiscal 1993. The significant increase was due to
the improving Japanese economy and the strengthening of the semiconductor
equipment market served by Canon, the Company's exclusive distributor in Japan.

                                       13

<PAGE>

     Gross Profit. Gross profit in fiscal 1994 amounted to $10.6 million and was
$1.6 million higher than in fiscal 1993 principally due to the increase in sales
and improvement in gross profit margins on actual shipments. As a percentage of
sales, gross profit in fiscal 1994 was 44.0%, as compared to 39.9% in fiscal
1993. The gross profit percentage of sales improvement was due in part to
benefits from continued improvement of the Company's cost structure and the
impact of the introduction of new lower-cost instrument products partially
offset by the lack of higher margins associated with the R&D contract revenues
earned in fiscal 1993 and by the impact of continued aggressive pricing actions
in response to sluggish market conditions in certain markets.

     Selling, General and Administrative Expenses. Selling, general and
administrative expenses in fiscal 1994 increased by $677,000 from fiscal 1993.
As a percentage of sales, selling, general and administrative expenses were
27.7% and 26.4% in fiscal 1994 and fiscal 1993, respectively. Selling expenses,
including advertising and sales promotion expenses related to the Company's new
electro-optical instrument products as well as commissions on higher sales,
increased $52,000 from fiscal 1993. Administrative expenses increased by
$625,000 as a result of legal expenses incurred in connection with the Company's
litigation against WYKO Corporation for patent infringement. Additional
administrative costs incurred in fiscal 1994 were associated with the
implementation of a new Business Management Information System.

     Research, Development and Engineering Expenses. R&D expenses in fiscal 1994
totaled $2.8 million and decreased by $291,000 from fiscal 1993, principally as
a result of lower spending on project materials as the majority of new products
were introduced in fiscal 1993 or early in fiscal 1994. As a percentage of
sales, research and development costs were 11.5% and 13.6% in fiscal 1994 and
fiscal 1993, respectively. During the quarter ended September 30, 1992, the
Company received a $1.7 million fixed price research and development contract
from Canon Inc. Revenues under the contract were recorded under the cost-to-cost
percentage of completion method of accounting. The contract was completed in the
first quarter of fiscal 1994 with the final $340,000 of net sales under the
contract being recorded in the quarter ended September 30, 1993.

     Operating Profit (Loss). In fiscal 1994, the Company had operating profit
of $1.2 million (4.8% of net sales) as compared to a $26,000 operating loss in
fiscal 1993. The significant improvement resulted principally from higher gross
profit.
   
     Other Income (Expenses). Interest income in fiscal 1994 amounted to
$338,000 and was $41,000 less than in fiscal 1993, principally due to lower
interest rates on the Company's marketable securities. Interest expense
decreased in fiscal 1994 by $18,000 from $69,000 in fiscal 1993 primarily as the
result of lower principal balances and lower interest rates on the Company's
long-term debt in fiscal 1994. The principal reason for the change in
miscellaneous income (expense), net in fiscal 1994 versus fiscal 1993 was the
absence of income, which the Company recognized in June 1993, resulting from a
$400,000 contingent payout by LaserMike in conjunction with its purchase of the
IMAGE Product Line in June 1992.
    
                                       14
<PAGE>


  Quarterly Comparisons

     The following table sets forth certain quarterly financial data for the
first quarter of fiscal 1996 and the four quarters in each of fiscal years 1995
and 1994 as well as certain of such information expressed as a percentage of net
sales for the same period. This quarterly information is unaudited, but has been
prepared on the same basis as the annual financial statements and, in
management's opinion, reflects all adjustments, consisting only of normal
recurring adjustments, required for a fair presentation of the information for
the periods presented. The operating results for any quarter are not necessarily
indicative of results for any future period.

                 SELECTED QUARTERLY CONSOLIDATED FINANCIAL DATA
                    (In thousands, except per share amounts)

<TABLE>
<CAPTION>

                                              Fiscal 1994                              Fiscal 1995                Fiscal 1996
                                    --------------------------------------  ------------------------------------   ---------
                                    Sept. 30, Dec. 31,  Mar. 31,  June 30,  Sept. 30, Dec. 31, Mar. 31, June 30,   Sept. 30,
                                      1993      1993      1994     1994        1994     1994     1995     1995       1995
                                     ------    ------    ------   ------     ------   ------    ------  --------    -------
<S>                                  <C>       <C>       <C>      <C>        <C>      <C>       <C>      <C>        <C>    
  Statement of Earnings Data:                                                                           
  Net sales .....................    $5,867    $6,120    $5,993   $6,160     $5,858   $7,097    $8,718   $10,560    $11,341
  Gross profit ..................     2,432     2,688     2,862    2,633      2,404    3,245     4,103     4,479      5,004
  Selling, general and
   administrative expenses ......     1,580     1,800     1,678    1,615      1,500    1,641     1,567     1,829      1,960
  Research, development and
   engineering expenses .........       737       628       713      708        669      793     1,043     1,462      1,426
  Operating profit ..............       115       260       471      310        235      811     1,493     1,188      1,618
  Other income (expense) ........        59        58       -0-       55         13       33        32       151         60
  Income tax expense ............        64       118       174       54         92      311       605       199        588
  Net earnings ..................       110       200       297      311        156      533       920     1,140      1,090
  Earnings per common and                                                                               
   common equivalent share(1) ...    $ 0.03    $ 0.05    $ 0.07   $ 0.08     $ 0.04   $ 0.13    $ 0.21   $  0.25    $  0.23
  Weighted average common
   shares and common dilutive
   equivalents outstanding ......     3,962     3,986     4,019    3,983      3,971    4,068     4,371     4,636      4,670
  As a Percentage of Net Sales:
  Gross profit ..................      41.5%     43.9%     47.8%    42.7%      41.0%    45.7%     47.1%     42.4%      44.1%
  Selling, general and
   administrative expenses ......      26.9      29.4      28.0     26.2       25.6     23.1      18.0      17.3       17.3
  Research, development and                                                                             
   engineering expenses .........      12.6      10.3      11.9     11.5       11.4     11.2      12.0      13.8       12.6
  Operating profit ..............       2.0       4.2       7.9      5.0        4.0     11.4      17.1      11.3       14.3
  Other income (expense) ........       1.0       0.9       0.0      0.9        0.2      0.5       0.4       1.4        0.5
  Income tax expense ............       1.1       1.9       2.9      0.9        1.6      4.4       6.9       1.9        5.2
  Net earnings ..................       1.9       3.3       5.0      5.0        2.7      7.5      10.6      10.8        9.6

- --------------
<FN>

(1)  Quarterly per share earnings do not necessarily equal the total per share
     earnings reported for the year as a result of the dilutive effect of common
     stock equivalents on the calculation of per share earnings.
</FN>
</TABLE>

     The Company has experienced quarterly fluctuations in results of operations
and anticipates that these fluctuations will continue. These fluctuations have
been caused by various factors, including the buying patterns of the Company's
target market, the number and timing of new product introductions and
enhancements, the timing of product shipments and marketing. Future results of
operations may fluctuate as a result of these and other factors, including the
Company's ability to continue to develop innovative products, the introduction
of new products by the Company's competitors, the Company's product and customer
mix, the level of competition and overall trends in the economy.

     Net sales remained relatively constant throughout the four quarters of
fiscal 1994 and the first quarter of fiscal 1995, as the Company was introducing
new products to the market, the majority of which had lower per unit selling
prices than the products being replaced. Beginning in the quarter ended December
31, 1994, the Company began shipping certain of its instrument products at an
accelerating level, primarily the Company's motion control products, which are
used in semiconductor photolithography, and the Company's first automated,
on-the-production-line

                                       15

<PAGE>

optical inspection instrument, the Automated Air Bearing Surface Analysis System
or AAB. Gross profit as a percentage of sales has typically been somewhat higher
in the Company's second and third fiscal quarters. Factors that have typically
affected gross profit margins include product mix, volume-related efficiencies
and the degree to which sales occur through direct sales channels. The Company
strictly controls selling, general and administrative expenses. The increases in
selling, general and administrative expenses as a percentage of sales in the
second and third quarters of fiscal 1994 resulted primarily from expenses
incurred in connection with patent litigation brought by the Company as to which
the Company was awarded a judgment of nearly $2.7 million in damages (currently
on appeal). The Company has not recorded any gain from this litigation and will
not do so until a final determination of the award is made. R&D expenses as a
percentage of sales remained relatively constant until the quarter ended March
31, 1995, during which the Company established a research and development
facility in Simi Valley, California that focused on development of products for
the data storage industry. The Company has historically adjusted its tax
provision in its fiscal fourth quarter because a significant portion of the
determinants of its effective tax rate can fluctuate substantially from quarter
to quarter.

Liquidity and Capital Resources
   
     At September 30, 1995, working capital was $18.0 million, an increase of
$960,000 from the amount at June 30, 1995. The Company had cash and cash
equivalents of $1.5 million and marketable securities available-for-sale
amounting to $7.3 million for a total of $8.9 million at September 30, 1995, a
decrease of $1.3 million from the amount of cash and cash equivalents and
marketable securities at June 30, 1995. Receivables increased by $1.7 million,
and inventory increased by $431,000 from the amounts at June 30, 1995. The
receivables increase was due primarily to the growth in net sales in the first
quarter of fiscal 1996, which were $781,000 higher than the fourth quarter of
fiscal 1995, and by a delay in collecting a significant amount of receivables
until just after the close of the quarter ended September 30, 1995. Inventory
increased primarily to support the growth in sales of the Company's
electro-optical instruments. Accounts payable decreased by $190,000 in the first
quarter of 1996 to $2.3 million.
    
     The Company's expenditures for property, plant and equipment totaled
$474,000 in the quarter ended September 30, 1995, which was approximately the
same as in the same period in the prior fiscal year. Although the actual level
will be influenced by many factors, the Company anticipates that expenditures
for plant and equipment in fiscal 1996 will be approximately the same as in
fiscal 1995 ($1.6 million). On June 23, 1995, the Company's Board of Directors
approved the purchase of approximately 22 acres of land adjacent to the
Company's facility in Middlefield, Connecticut for a purchase price of $440,000
from certain Selling Stockholders. The purchase is expected to occur during the
quarter ending March 31, 1996. See "Principal and Selling Stockholders--Material
Relationships of Certain Selling Stockholders with the Company."

     As of September 30, 1995, there were no borrowings outstanding under the
Company's $3.0 million bank line of credit. Unused amounts under the line of
credit are available for short-term working capital needs. Stockholders' equity
at September 30, 1995, increased by $1.1 million from June 30, 1995 to $23.4
million, principally due to net income of $1.1 million.

                                       16

<PAGE>


                                    BUSINESS

     Zygo Corporation designs, develops, manufactures and markets high
performance, noncontact electro-optical measuring instruments, systems and
accessories, and optical components to precise tolerances both for sale and for
use as key elements in its own products. Utilizing proprietary laser and optical
technology combined with advanced software and electronics, the Company's
precision noncontact measuring instruments and systems enable manufacturers in a
variety of industries, including data storage, semiconductor and precision
optics, to increase operating efficiencies and product yields by identifying and
collecting quantitative data on product defects, both during and after the
manufacturing process. Zygo's optical components are used in many applications,
including laser fusion research, semiconductor manufacturing equipment and
aerospace optical systems, as well as being an integral part of precision
optical instruments.

     Predominantly all of the Company's instruments and systems employ either a
laser or white light source to make noncontact measurements. Through a process
called interferometry, a pattern of bright and dark lines (called fringes)
results from an optical path difference between a reference and a measurement
beam. Zygo's products then analyze these patterns through a series of steps and
generate quantitative three-dimensional surface profiles, which are used to
determine conformity to dimensional specification and, increasingly, to analyze
and enhance manufacturing processes. Interferometric measurement instruments and
systems are used by a variety of industries, including by the data storage
industry to inspect and analyze the surface of computer hard disks and
read/write heads, and by the semiconductor industry for high precision distance
measurement and motion control.

Background

     Historically, measurement and inspection instrumentation has consisted of
contact profiling devices and visual qualitative inspection systems. Advancing
technologies have required manufacturers in a variety of industries to produce
smaller products with more precise tolerances and decreased design geometries,
not capable of adequately being measured by the devices and systems then being
utilized. For example, contact profilers and visual qualitative inspection
systems are inadequate for quantitative analysis of critical dimensions such as
air bearing surface geometry and pole-tip recession necessary in high volume
production of read/write heads.

     The demands on these manufacturers to produce more powerful and smaller
products with more precise tolerances have fueled demand for precision
noncontact measuring instruments. In fact, high performance, noncontact
metrology is an enabling technology for the semiconductor, data storage and
other vital high technology industries. The trend towards miniaturization and
tighter tolerances creates new challenges for manufacturers as they are forced
to handle, measure and test ever smaller components. As piece part dimensions
and tolerances become smaller, "nano technology scale" precision is
necessitated. Disk drive manufacturers, for example, continue to increase drive
capacity while reducing the size of drives. For this to happen, the recording
head must fly closer to the disk and the head itself must be made smaller and to
greater precision.

     In addition, until recently, noncontact measuring instruments have been
limited almost exclusively to use by quality control laboratories for off-line
inspection on a test basis only. The historical cyclical nature of the
semiconductor industry, the data storage industry and other capital goods sector
industries, together with increased competitive forces in these industries, have
forced these industries to no longer depend solely on sales growth to fuel
financial performance improvement, but rather to focus greater attention on the
need to reduce production defects and significantly increase production yields.
These pressures on manufacturers to improve productivity and quality have
required integration of process control technologies directly into the
manufacturing process, allowing manufacturers to test a greater percentage of
their components while in production. Instrumentation increasingly is being
sought to more accurately measure the conformity of parts to their
specifications and detect defects directly on the manufacturing line, and to
address other specific needs of the manufacturers to improve production yields.
As the data storage industry, semiconductor industry and other high technology
industries are forced to install more sophisticated and difficult to manage and
control production and assembly processes, a greater degree of on-line, high
precision, surface metrology and defect detection systems is required.

                                       17


<PAGE>


     Concurrently with the rapidly increasing requirements for nano-technology
scale process control techniques, many of these industries, particularly the
semiconductor and data storage industries, are experiencing very rapid growth.
According to a recent report of DISK/TREND, Inc., a leading source of market
information and intelligence for the hard drive or disk storage industry, the
1995 worldwide shipments of rigid disk drives are estimated to be 87.8 million
units, an increase of approximately 25% over 1994 levels, with forecasts of 132
million disk drives expected to be sold in 1998. Driven by new software
requirements and expanded personal computer usage, the report indicates that not
only will disk drive units increase but capacities will also climb rapidly,
implying greater need for storage in smaller packages, i.e. smaller heads,
better finished disks, closer flying heights. In the semiconductor industry,
VLSI Research, Inc. estimates the market for semiconductors to be $138 billion
in 1995 and to grow to $254 billion in the year 2000. Other industry
representatives are forecasting growth to annual sales levels as high as $300
billion by the year 2000.

The Zygo Solution

     Zygo introduced its first interferometer in 1972. All of the Company's
instruments and systems utilize interferometry to accomplish precise measurement
of a variety of surface geometries or to control motion and minute movements
during the manufacturing process. In interferometry, a pattern of bright and
dark lines (fringes) results from an optical path difference between a reference
and a measurement beam. Incoming light is split inside an interferometer, one
beam going to an internal reference surface and the other to a sample. After
reflection, the beams recombine inside the interferometer, undergo constructive
and destructive interference, and produce the light and dark fringe pattern. The
number, shape and position of the lines in the fringe patterns can be analyzed
to provide quantitative surface structure analysis. The Company's
interferometric instruments and systems utilize highly sophisticated subsystems,
including: precision optical components such as beamsplitters, reference optics
and transmission optics; stable and long-life laser or other light sources;
piece part positioning stages; high-powered workstations or PCs for processing
and analyzing fringe pattern data; and a variety of peripheral components such
as monitors and printers.

     Interferometry has certain inherent benefits over other forms of surface
and distance measurement as it provides noncontact, quantitative, full field of
view, ultra-high resolution surface analysis in three dimensions, which results
in higher analysis throughput and lower cost of ownership for the user.
Additionally, interferometric metrology is often an enabling technology as
dimensions and tolerances of many parts in high technology applications have
dimensions below 250 nanometers.

     The Company's instruments and systems provide critical productivity
enhancement capability to the data storage, semiconductor and other high
technology markets. The Company has worked closely with leaders of the data
storage, semiconductor and other capital goods sector industries to help these
manufacturers meet the ever-increasing production demands of their industries.
Utilizing proprietary laser and optical technology combined with advanced
software and electronics, the Company's precision noncontact measuring
instruments and systems enable manufacturers in a variety of industries to
increase operating efficiencies and product yields by identifying and collecting
quantitative data on product defects, both during and after the manufacturing
process.

     A wide range of operational features and data analysis capabilities are
available on the Company's measurement instruments. Instrumentation has been
designed with maximum flexibility to satisfy a customer's existing needs and to
be adaptable to satisfy expansion and growth. Certain measuring devices can be
used as needed in either the horizontal or vertical configuration, and on the
production line or in the development lab.

     To meet the rapidly changing and increasing requirements of manufacturers,
Zygo's business is transforming from that of an off-line quality control and
quality assurance test and measurement instrument supplier to an on-line
production improvement and yield management system provider. For example, the
Company's Automated Air Bearing Surface Analysis System measures the air bearing
surface geometry of read/write heads in-line as the heads are being
manufactured. The system performs quantitative measurements on seven critical
read/write head

                                       18

<PAGE>

parameters with a throughput of up to 20,000 heads per day and provides
real-time critical data to the manufacturing process control center to make
on-line production process changes, thereby reducing the number of defective
heads manufactured. The Company recognized another opportunity for yield
improvement in the data storage industry in flying height testing. Early in
calendar 1995, the Company formed a division in Simi Valley, California to
develop products for that industry with its first undertaking being focused on
the flying height tester. Together with the Company's engineers in Middlefield,
Connecticut, the team developed a production flying height tester and introduced
the product in September 1995; shipments of the Pegasus 2000 flying height
tester are expected to commence in the early part of calendar 1996. The Pegasus
2000 addresses one of the data storage industry's most critical requirements,
the ability to measure flying height at near contact. Another example of the
Company's instruments and systems which allow its customers to enhance
productivity and improve production yield is the ZMI-1000, used by semiconductor
manufacturers within their step and repeat photolithography systems to precisely
control the movement of the systems' x/y stage to a precision of one nanometer.
As product geometries and tolerances reduce and yield improvement becomes
increasingly important, new opportunities are continuously being explored.

Zygo Strategy

     The Company's objective is to expand its position as a leading worldwide
supplier of high performance, noncontact electro-optical measuring, production
control and yield management improvement instruments, systems and accessories
that improve the performance, quality, reliability, yield and cost of automated
manufacturing processes, and of optical components to precise tolerances. The
Company dedicates substantial resources to research and product development to
enable it to compete effectively in its market areas.

     Key elements of the Company's strategy include:
   
o    Maintain Enhanced Leadership Through Innovative Technical Solutions. By
     integrating its proprietary electro-optical technologies, proprietary
     applications software and unique system integration capabilities, the
     Company provides leading edge automated optical inspection solutions in the
     shortest possible time. The Company's core technologies of optical
     interferometry, optical metrology, system engineering integration,
     application software and precision optical component fabrication and
     coating are directly applied to meet the higher measurement precision,
     accuracy, resolution, data acquisition and data analysis requirements in
     the most demanding manufacturing processes of its customers. Throughout its
     history, the Company has met its customers' requirements through innovation
     and invention with 47 total patents, 37 of which have been issued in the
     last ten years, and nine U.S. patents applied for in the last 12 months.
    
o    Focus on New Market Segments. The Company's products have applications for
     a wide variety of industries. In the development of these products, the
     Company focuses on market segments which it believes have growth potential
     and in which Zygo can reasonably expect to become a leading manufacturer.
     The Company seeks to adapt the noncontact inspection and process control
     technology it develops for one application to other markets.

o    Broaden Customer Relationships. The Company focuses on establishing the
     strongest relationship with major industry leaders in its served markets.
     This is accomplished by working closely with its customers and identifying
     increasing numbers of applications for automated optical inspection and
     yield improvement systems. The Company also focuses on fully integrating
     its offerings into its customers' manufacturing processes through automated
     parts handling, enhanced product metrology and defect analysis, and by more
     complete integration into the customers' workcells by fully integrated
     process information networking, all geared to improve production. The
     Company intends, by forming closer customer alliances, to better understand
     the evolving needs of its customers and, through the application of
     innovative technology, to provide high performance, high quality, cost
     effective solutions to the production improvement requirements in the
     shortest possible cycle time. Through this solution-sales cycle, which
     further promotes a closer and longer term partnership relationship between
     the Company and its customers, the Company intends to attain a preferred
     position with major industry leaders.

                                       19


<PAGE>

o    Supply Quality Solutions Rapidly. The Company seeks to deliver high quality
     and high reliability system solutions in a minimal cycle time. To this end,
     the Company has installed an enterprise-wide total quality process where
     employee-led teams work to continuously improve the effectiveness and
     efficiency of its processes while searching out and removing areas of poor
     quality and waste. The Company's operations strategy focuses on internally
     providing those manufacturing services that add unique value in a rapidly
     changing customer needs environment.

o    Provide Uninterrupted Worldwide Service and Support. To support leading
     customers' continuous manufacturing processes, the Company insures optimal
     operation and reliable performance of its production control equipment
     through its worldwide customer support service group. Through a worldwide
     network of service representatives, the Company provides 24 hour on-demand
     maintenance services. Its service engineers have a unique skill set,
     including optical and electrical component repair, software, application
     and system integration diagnostic and problem solution capabilities.

o    Broaden Product Offerings and Markets Through Internal Developments and
     Acquisitions. The Company intends to broaden its product offerings by
     continuing to develop internally additional products and by aggressively
     pursuing the acquisition of companies where synergies can be identified.
     During the past twelve months the Company has formed a start-up operation
     in Simi Valley, California as a way to broaden its product offering and
     participation in the data storage industry. The Company has determined that
     these start-up operations can be an effective alternative to an acquisition
     when the technology resident in the Company is complementary to the market
     knowledge and expertise resident in the individuals hired to manage the
     start-up. The Company also maintains an active program of investigating and
     negotiating potential synergistic acquisitions which extend the Company's
     product lines or markets. The Company believes that its acquisition
     strategy is an important element of its total business strategy. To date,
     the Company has made a small acquisition of a manufacturer of high
     precision laser tubes, which allowed Zygo to bring in-house a technology
     that is critical to the performance of its motion control products.

Products

     Zygo manufactures high performance, noncontact electro-optical measuring
instruments, systems and accessories and optical components to precise
tolerances both for sale and for use as key elements in its own products. The
Company operates in a single business segment, electro-optics, and offers
products which fall into two general categories: (1) instruments, systems and
accessories and (2) precision optical components.

     Instruments, Systems and Accessories

     Zygo's product strategy is to develop its instruments and systems utilizing
modular designs where entire product families share several, if not all, of the
same components, modules and software. Zygo has redesigned all of its
instruments over the past three years and continues to upgrade its software and
enhance its products by adding features such as automated stages and parts
handling to many of its instruments and systems.

     All of the Company's instrument products utilize powerful processors that
facilitate high speed data acquisition and data analysis. The Company's
interferometric surface analysis microscopes and large aperture surface
measurement interferometers utilize the Company's proprietary MetroPro(R)
software, which has a graphical user interface that makes the product very user
friendly. The MetroPro(R) software, combined with super high-resolution graphics
and pull-down menus, provides the user with engineering solutions without
off-line processing. The software allows the user to record, print and store
measurement data locally as well as to distribute the data through networks for
process management and further analysis. Zygo's proprietary software provides
the Company with comparative advantage because of its high speed, powerful
analysis capability based on proprietary algorithms, easily configurable
screens, powerful image analysis modules and adaptability to new applications.

                                       20

<PAGE>

       ---Schematic Diagram of Data Storage Manufacturing Applications---



Zygo's instruments and systems used in a number of critical manufacturing steps
in the data storage industry.

     Interferometric Surface Analysis Microscopes

<TABLE>
<CAPTION>

- -----------------------------------------------------------------------------------------------------
                  Price
   Product        Range                 Measurement                            Application
- -----------------------------------------------------------------------------------------------------
<S>               <C>          <C>                                   <C>
  Maxim*GP         $60K        Roughness; Depths; Coplanarity;       Product and Process Development;
NewView 100         to          Micro-shape; Lengths; Widths;        On-line Process Control/Product
 AAB System       $150K                Area; Volumes                    Inspection; QC Inspection
- ------------------------------------------------------------------------------------------------------
</TABLE>

     The surface characteristics of many products in industries such as
semiconductor, data storage, fiber optics and medical implants, and with
increased applications in the paper, printing plates, coatings, and
pharmaceuticals industries, controls the performance of the product. As a
result, surface structure analysis is fundamental to many facets of research and
industry. The Zygo Maxim*GP, the fully automated AAB System, and NewView 100
microscopes combine advanced techniques of interferometry, microscopy, and
precision translation stages, to enable high precision surface analysis. Unlike
visual microscopes, Zygo's instruments provide measurement information as
quantitative three-dimensional images, two- and three-dimensional surface maps
with colors and shades representing relative heights of surface features, and
numeric results. The Maxim*GP is based on phase shifting interferometry to
provide very precise, fast measurements of specular ("mirror-like") or near
specular surfaces. The NewView 100 uses scanning white light interferometry to
measure non-specular surfaces.

     Large Aperture Surface Measurement Interferometers

<TABLE>
<CAPTION>

- -------------------------------------------------------------------------------------------------
               Price
Product        Range                 Measurement                            Application
- -------------------------------------------------------------------------------------------------
<S>            <C>        <C>                                    <C>     
GPI LC         $12K             Flatness; Sphericity;            Product and Process Development;
GPI ST          to              Radius of Curvature;                 Off-line Process Control;
GPI XP         $250K           Optical System Quality;                     QC Inspection
                          Transparent Material Homogeneity
- -------------------------------------------------------------------------------------------------
</TABLE>

     The Company's interferometers for large surface measurement, the Growth
Potential Interferometer ("GPI") family of upgradable instruments, basically
consist of enlarged versions of the three-dimensional microscope, designed to
perform surface profile analysis on larger surface areas. Each member of the GPI
interferometer family is

                                       21

<PAGE>


 designed to address a specific level of measurement
needs. While all GPI models have essentially the same purpose--noncontact
measurement of flat or spherical surfaces and transmitted wavefront measurement
of optics--they differ widely in operational features and data analysis
capabilities. The GPI family of products is used extensively in the optics
industry to measure glass or plastic optical components like flats, lenses and
prisms, and more recently in a growing number of other situations to measure
precision components such as hard disks, bearing and sealing surfaces, polished
ceramics and contact lens molds.

     Flying Height Tester

<TABLE>
<CAPTION>

- -------------------------------------------------------------------------------------------------
                      Price
   Product            Range                   Measurement                      Application
- -------------------------------------------------------------------------------------------------
<S>                   <C>               <C>                             <C>
Pegasus 2000          $200K             Read/Write Head Gimbal;           Product Development;
                       to               Assembly Flying Height          Off-line Process Control;
                      $250K                                                   QC Inspection
- -------------------------------------------------------------------------------------------------
</TABLE>


     In September 1995, the Company introduced its newest product, the Pegasus
2000, a flying height tester. The flying height tester measures the height at
which a read/write head flies over the surface of a magnetic disk within the
disk drive. The industry demands for increased storage capacity are compelling
manufacturers to reduce the flying height, as increased amounts of data can be
stored on magnetic heads the closer they fly to the disk. The Pegasus 2000
offers several unique capabilities to the data storage industry. As flying
heights are reduced, manufacturers require measurement instruments which can
measure at near-contact. Zygo's flying height tester actually increases in
accuracy the closer the read/write head flies over the surface of the disk.
Additionally, due to significant increases in disk storage requirements,
manufacturers require easy-to-use, high throughput testers. The Pegasus 2000 has
been designed as a production oriented tester. For example, the system is
capable of having a head loaded while a second head is being tested. Also, the
tester automatically calibrates the sensor requirements of each head rather than
requiring operator inputs. The Company expects to commence shipments of its
Pegasus 2000 in the early part of calendar 1996.

      ---Schematic Diagram of Semiconductor Manufacturing Applications---

The Company's instruments, systems and precision optical components used in both
OEM and end user semiconductor manufacturing applications.

                                       22

<PAGE>


     Precision Distance and Angle Measurement Interferometers

<TABLE>
<CAPTION>

- ----------------------------------------------------------------------------------------------------
                Price
 Product        Range               Measurement                              Application
- ----------------------------------------------------------------------------------------------------
<S>             <C>           <C>                               <C>
ZMI-1000        $15K          Distance; Angle; Velocity;        Semiconductor and Flat Panel Display
                 to                  Time/Position               Manufacturing; Product and Process
                $100K                                           Development; Precision Machine Tools
- ----------------------------------------------------------------------------------------------------
</TABLE>

     Fast, precise control of machine motion is the primary challenge in many
production processes. Industries as diverse as semiconductor and flat panel
display production and optical component manufacturing require systems to
measure the position of a tool relative to a part under fabrication. The
Company's ZMI-1000 Laser Interferometer system provides the measurements that
control the position of some of the world's most sophisticated machinery.
Through the use of a directed laser beam reflecting from the moving portion of
the machine, the ZMI-1000 can tell the machine's computer control systems about
movements as small as 1.24 nanometers (billionths of a meter). This level of
accuracy can be compared to the finest geometries of semiconductors, which are
approximately 350 nanometers. Its design also accommodates fast motions and
maintains its precision at speeds in excess of a meter per second. Applications
for these interferometers include accurately measuring and controlling, while
they are in motion, the x, y, and theta stages in photolithography equipment
that is used in making semiconductors and flat-panel video displays. Although
Zygo sells this instrumentation to a large number of customers, the majority of
these interferometers are sold on an OEM basis to Canon. Zygo is Canon's
sole-source provider of motion control devices for use in Canon's step and
repeat photolithography systems. These systems perform a critical function in
the process of manufacturing semiconductors.

     Precision Optical Components
- -------------------------------------------------------------------------------
         Component Types                                 Application
- -------------------------------------------------------------------------------
         Flats; Spheres;                         Laser and White Light Based
      Waveplates; Mirrors;                          Optical Instruments;
Precision Mechanical Components;                     High Power Lasers;
       Aerospace Windows;                             Photolithography;
    Photolithographic Stages                         Military; Research
- -------------------------------------------------------------------------------

     The Company believes it is a world leader in the design and manufacture of
highly accurate, "cosmetically excellent" surfaces and angles on plano
components ranging in size from small prisms to large mirrors, scanners,
aerospace windows and laser amplifier disks. Zygo's precision machining
capability is used to make complex glass and ceramic parts such as stage mirrors
and other lightweight structures. Operations at the Company's state-of-the-art
optical components manufacturing facility include machining, shaping,
generating, grinding, polishing and edging. The Company utilizes technology that
it has developed and incorporated into rotary polishing machines designed and
built by the Company. The Company's thin film coating capability includes
metallic and high-efficiency dielectric coatings for transmissive or reflective
applications, in the ultraviolet, visible and infrared regions of the spectrum.
The Company also applies polarization, beamsplitter and anti-reflection
coatings.

     To ensure quality control of its products, Zygo maintains complete control
over every facet of manufacturing, from grinding and polishing to coating and
assembly. At each stage of production, opticians test and verify the components
using sophisticated interferometric measuring instruments designed and
manufactured by Zygo. The Company believes that this vertical integration gives
Zygo a distinct competitive advantage over most of its competitors in the
production of its precision optical components.

Markets and Customers

     The growing need for dimensional control to the subnanometer level has
created a growing need for the Company's instruments and systems among both
OEM's and end users. Traditionally, the Company's largest market has been high
precision optical components and systems. As the market demands for greater
tolerance control in the manufacturing process has increased, particularly in
the data storage and semiconductor markets, Zygo has been able to meet these
demands with on-the-production-line process and quality control instruments and
systems as well as with its off-line quality control instruments. As a result,
the data storage and semiconductor industries are now the Company's largest
markets.

                                       23

<PAGE>


         The following table sets forth the Company's product sales by industry
category:

<TABLE>
<CAPTION>


                                                                                 University and
                                                                     Industrial   Research and
                                                                    Surfaces and   Industrial     Calendar Quarter
                                         Semi-      Data               Machine     Development     of Introduction
  Product                              Conductor   Storage  Optics     Control   and/or Centers       to Market
  -------                              ---------   -------  ------  ------------ --------------   -----------------
<S>                                        <C>        <C>      <C>         <C>           <C>     <C>
  Interferometric
  Surface Analysis Microscopes
   NewView 100                             X          X        X           X             X       3rd Quarter, 1993
   Maxim* GP                                                   X                         X       1st Quarter, 1994
   AAB System                                         X                                          3rd Quarter, 1994

  Large Surface
  Measurement Interferometers
   GPI XP                                  X          X        X           X             X       3rd Quarter, 1993
   GPI ST                                                      X           X             X       3rd Quarter, 1993
   GPI LC                                             X                    X                     3rd Quarter, 1993

  Precision Distance and Angle
  Measurement Interferometers
   ZMI-1000                                X                               X             X       1st Quarter, 1994

  Flying Height Tester
   Pegasus 2000                                       X                                          3rd Quarter, 1995

  Precision Optical
   Components                              X          X        X           X             X              NA

</TABLE>

   
     Historically, a relatively limited number of customers have accounted for a
substantial portion of the Company's revenues. In fiscal years 1994 and 1995,
sales to the Company's top two customers accounted for approximately 41.2% and
46.8%, respectively, of the Company's net sales. During these fiscal years,
sales to Canon, the Company's largest customer, accounted for approximately
32.1% and 29.6%, respectively, of the Company's net sales. Canon, one of the
original investors in the Company, is a valuable strategic partner of the
Company and the relationship is important to both companies for many reasons.
Sales to Canon include products that Canon uses in its manufacturing facilities,
such as the Company's large aperture surface measurement interferometers, which
are used to quantitatively analyze the surface of optics Canon produces for its
photolithographic steppers, and Zygo's motion measurement components and systems
which are incorporated into Canon's steppers for controlling the x/y stage in
that product. Zygo is Canon's sole source for motion control systems. Sales to
Canon also include optical components and instruments, systems and accessories
sold by Canon as Zygo's sole distributor in Japan. In fiscal 1995, Seagate, a
leading manufacturer of computer disk drives and related hardware and software,
accounted for an additional approximately 17.2% of the Company's net sales;
sales to Seagate were insignificant in fiscal 1994. No other customer accounted
for greater than approximately 3% of the Company's net sales in fiscal 1994 or
1995.
    
                                       24

<PAGE>


     The following is a representative list of end users of the Company's
products:

<TABLE>
<CAPTION>

                                                                                          Industrial Surfaces &
Semiconductor             Data Storage                 Optics                             Machine Control
- -------------             ------------                 ------                             ---------------------
<S>                       <C>                          <C>                                <C>
   
Canon                     AIWA                         Allied Bendix                      Allied Signal
DuPont                    Akashic                      Bausch & Lomb                      Anorad
ETEC                      Applied Magnetics            Canon                              Cranfield Precision
IBM                       Conner Peripherals           Corning                            Engineering
KLA                       Hewlett Packard              Hughes                             Cummins Engine
Motorola                  Hitachi                      Itek                               Dover Instruments
NEC                       Komag                        Laboratory for Laser Energetics    General Motors
SVG                       Maxtor                       Lawrence Livermore                 Gerber Scientific
Sematech                  Quantum                        National Laboratories            Martin Marietta
Tencor                    Read-Rite                    Melles Griot                       National Institute of
Texas Instruments         SAE Magnetics                Nikon                              Standards & Technology
Toshiba                   Seagate                      OCLI                               Rank Taylor Hobson
Ultratech Stepper         Sony                         Perkin Elmer                       Saint-Gobain/Norton
XRL                       TDK                          Schott Glass                       Sikorsky Aircraft
                          Toshiba                      Vistakon                           Stanadyne
                                                       Zeiss                              3-M
    
                                                       
</TABLE>

Sales, Marketing and Customer Support

     The Company sells its products worldwide through a combination of direct
sales staff and independent distributors and sales representatives. The Company
maintains a direct sales staff of four persons at its headquarters in
Middlefield, Connecticut and three persons in Santa Clara, California for
domestic sales. International sales are made through more than ten
representatives and distributors, covering sales and service in 20 countries
including Japan, Singapore, Malaysia, South Korea, Taiwan, Philippines, United
Kingdom, Germany, Italy and France.

     The following table sets forth the percentage of the Company's total sales
(including sales delivered through distributors) by location during the past
three years:

                                              Year Ended June 30,
                                       ---------------------------------
                                      1993           1994          1995
                                      ----           ----          ----
United States ....................    61.7%          54.3%         53.5%
Japan ............................    20.5           31.4          29.9
Pacific Rim ......................    10.5            8.8          10.2
Other (primarily Europe) .........     7.3            5.5           6.4

     Substantially all of the Company's export sales are negotiated, invoiced
and paid in United States dollars. International sales and foreign operations
are subject to certain inherent risks.

     The selling process for the Company's products frequently involves
participation by sales, marketing, applications specialists and engineering
personnel. The Company's marketing activities also include participation in
international standards organizations, trade shows, publication of articles in
trade journals, participation in industry forums and distribution of sales
literature. In addition, the Company's strategic relationships with customers
serve as highly visible references.

     The Company believes that its strong commitment to service is essential,
based on the growing complexity of the equipment used in the manufacturing
process by the Company's customers. The Company's customer support and service
staff currently consists of 12 persons. In addition, the Company's distributors
and sales representatives offer a worldwide network for customer support,
providing 24 hour on-demand maintenance services. The service engineers are
skilled in optical and electrical component repair, software, application and
system integration, diagnostic and problem solving capabilities. Zygo also
offers training programs and maintenance contracts for its customers.

                                       25

<PAGE>


Backlog

     The Company's backlog at September 30, 1995, June 30, 1995 and September
30, 1994, was approximately $14.0 million, $13.0 million and $5.6 million,
respectively. The significant increase from September 30, 1994 resulted
primarily from strong demand for the Company's instrument products, particularly
its distance measuring interferometers used in motion control applications
(primarily in the semiconductor industry), and the Company's microscope products
used in many applications in the disk drive industry (in particular the
Company's Automated Air Bearing analysis system which provides fully automated
quantified measurement and analysis of read-write heads). The Company includes
in its backlog only those customer orders for which it has accepted written
purchase orders against which it expects to ship within the following twelve
months. All orders are subject to cancellation or delay by the customer with
limited or no penalty. Historically, cancellation or reduction of orders has not
had a significant impact on the Company's results of operations.

Research, Development and Engineering
   
     The Company operates in an industry that is subject to rapid technological
change and engineering innovation. The Company distinguishes its instrument
products on the basis of its unique electro-optical sensor technology, its
software capability and its skill in systems integration. Because the Company
believes that its ability to compete effectively with its instruments and
systems in its markets depends in part on maintaining its expertise in applying
new technologies and developing new products, the Company dedicates substantial
resources to research and development. At September 30, 1995, the Company
employed 34 individuals within its R&D operations, including 11 individuals with
advanced degrees of which four individuals have earned doctoral degrees. During
the second half of fiscal 1995, the Company formed an R&D facility in Simi
Valley, California, for the purpose of developing test and measurement
instruments for the disk drive industry. The first such product development
effort at the new facility focused on flying height testing and, in conjunction
with the Company's engineers in the Middlefield, Connecticut facility, produced
the Company's Pegasus 2000 flying height tester. See "--Products." In addition,
as an integral part of the Company's product development strategy, Zygo has
formed technical relationships with several customers. Zygo's strategy is to
form close technical working relationships with the leading suppliers in its
markets and thereby develop products and systems which have the greatest
relevancy to the marketplace in general. In connection with its R&D operations,
Zygo also maintains a close working relationship with various research groups
and academic institutions in the United States as well as abroad.
    
     The Company believes that continued enhancement, development and
commercialization of new and existing products and systems is essential to
maintaining and improving its leadership position. The Company intends to direct
its research and development activities in several different areas. For example,
Zygo continues to seek to develop products that have greater measurement range
and precision to address new markets. Additionally, Zygo intends to continue to
add products that are automated in-process instruments and systems. There can be
no assurance that these efforts or any other product development efforts of the
Company will be successful in producing products that respond to technological
changes or new products introduced by others.

     R&D expenses of the Company totaled $1.4 million, $4.0 million, $2.8
million and $3.1 million for the three months ended September 30, 1995 and in
fiscal 1995, 1994 and 1993, respectively. Substantially all of the R&D expenses
support the Company's instruments, systems and accessories. As a percentage of
sales, R&D costs were 12.6% in the first quarter of fiscal 1996, and 12.3%,
11.5% and 13.6% in fiscal 1995, 1994 and 1993, respectively.

Patents and Other Intellectual Property Rights

     The Company relies on a combination of patent, copyright, trademark and
trade secret laws and license agreements to establish and protect its
proprietary rights in its products. The Company believes, however, that its
success depends to a greater extent upon innovation, technological expertise and
distribution strength. The Company requires each of its employees to enter into
standard agreements pursuant to which the employee agrees to keep confidential
all proprietary information of the Company and to assign to the Company all
rights in any proprietary information or technology made or contributed by the
employee during his or her employment or made thereafter as a result of any
inventions conceived or work done during such employment. Despite these
precautions, it may be possible for a third party to copy or otherwise obtain
and use the Company's products or technology without

                                       26

<PAGE>

authorization or to develop similar technology independently. In addition,
effective patent, copyright and trade secret protection may be unavailable or
limited in certain foreign countries.

     The Company currently holds 39 United States patents and eight foreign
patents covering existing and potential products and has applied for nine
additional patents in the United States and seven additional foreign patents.

     Zygo, the Zygo logo and Maxim*3D are registered trademarks, and the
Company also holds several nonregistered trademarks including Maxim*GP, New
View 100, Growth Potential Interferometer, GPI, ZMI-1000, Pegasus 2000 and AAB
System.

Manufacturing

     The Company's principal manufacturing activities are conducted at its
facility in Middlefield, Connecticut. The Company maintains a state-of-the-art
optical components manufacturing facility, specializing in the fabrication,
polishing and coating of plano (flat) optics for sales to third parties, as well
as the manufacturing of a wide variety of optics that are used in the Company's
instrument products. The Company's manufacturing activities for its instrument
products consist primarily of assembling and testing components and
subassemblies some of which are supplied from within the Company and others are
supplied by third party vendors and then integrated into the Company's finished
products. Many of the components and subassemblies are standard products,
although certain items are made to Company specifications. The Company also
maintains Computer Numerical Control (CNC) metal fabrication equipment for
in-house production of strategic metal formed components.

     Certain components and subassemblies incorporated into the Company's
systems are obtained from a single source or a limited group of suppliers.
Management routinely monitors single or limited source supply parts, and the
Company endeavors to ensure that adequate inventory is available to maintain
manufacturing schedules should the supply of any part be interrupted. Although
the Company seeks to reduce its dependence on sole and limited source suppliers,
it has not qualified a second source for these products and the partial or
complete loss of certain of these sources could have an adverse effect on the
Company's results of operations and damage customer relationships. Further, a
significant increase in the list price of one or more of these components could
adversely affect the Company's results of operations.

     The Company also maintains a state-of-the-art fully integrated management
information system which includes all business modules (capacity planning,
materials requirements planning, order entry, financials, etc.) necessary to
manage the Company's growing operations.

Competition

     Although the Company believes that its products are unique, competitors
offer technologies, instrumentation and systems that are capable of performing
certain of the functions performed by the Company's products. The Company faces
competition from a number of companies in all its markets, some of which have
greater manufacturing and marketing capabilities, and greater financial,
technological and personnel resources. In addition, the Company may compete with
the internal development efforts of its current and prospective customers. The
Company believes that its instrumentation and products offer several advantages
over competitive products in terms of accuracy, speed, flexibility, cost and
ease of use. Although the Company has attempted to protect the proprietary
nature of such products, it is possible that any of the Company's products could
be duplicated by other companies in the same general market. In addition, there
can be no assurances that the Company would be able to compete with similar
products produced by a competitor.

                                       27

<PAGE>


Employees

     As of September 30, 1995, the Company employed a total of 212 persons,
including 118 in manufacturing, 34 in research and development, 20 in sales and
marketing and 12 in customer service. To date, the Company has been successful
in attracting and retaining qualified technical personnel, although there can be
no assurance that this success will continue. None of the Company's employees
are covered by collective bargaining agreements or are members of a union. The
Company has never experienced a work stoppage and believes that its relations
with its employees are excellent.

Properties

     The Company's principal operations are located in an owned 100,000 square
foot building in Middlefield, Connecticut. The Company also owns 30 acres of
undeveloped land adjacent to its principal facility. In June 1995, the Company's
Board of Directors approved the purchase of approximately 22 acres of land
adjacent to the Company's principal facility from certain Selling Stockholders.
See "Principal and Selling Stockholders--Material Relationships of Certain
Selling Stockholders with the Company."

Legal Proceedings

     On June 29, 1988, the Company filed suit in the U.S. District Court in
Arizona against WYKO Corporation for patent infringement based on the belief
that the WYKO 6000 interferometer infringed certain patents owned by Zygo. On
March 1, 1993, the United States District Court (District of Arizona) rendered a
Memorandum Opinion and Findings of Fact and Conclusions of Law in the matter of
the patent suit. The conclusions of the court were that Zygo's patent is valid,
the WYKO Model 6000 interferometer infringes the Zygo patent, that WYKO
Corporation is liable to Zygo Corporation for any damages suffered as a result
of WYKO's infringement of Zygo's patents by making, selling, and using the WYKO
Model 6000 interferometer, and that the amount of the monetary judgment and
other relief shall be determined following a trial on the issue of damages. The
damage phase of the trial was held from November 29, 1993 through December 6,
1993. The Court rendered its judgment on June 2, 1994, awarding the Company
approximately $2.7 million plus recovery of certain costs to be awarded by the
Court which were incurred by the Company in connection with the conduct of the
trial and entered a permanent injunction prohibiting further sales of the WYKO
Model 6000 interferometers found to infringe. An appeal of the District Court's
decision was filed by WYKO on August 9, 1994 with the Court of Appeals for the
Federal Circuit located in Washington, D.C. The oral argument of the appeal was
heard by the Court of Appeals on March 9, 1995. No ruling has been rendered by
the Court of Appeals. The Company has not recorded any gain from the District
Court's ruling and will not until a final determination of the award is made.

                                       28

<PAGE>


                                   MANAGEMENT

  Executive Officers, Key Employees and Directors

         The executive officers, key employees and directors of the Company and
their ages are as follows:

<TABLE>
<CAPTION>

     Name                             Age                   Positions
     ----                             ---                   ---------
<S>                                   <C>      <C>
   
Gary K. Willis(1) ................    50       President, Chief Executive Officer and Director
Mark J. Bonney ...................    41       Vice President, Finance and Administration,
                                                 Treasurer and Chief Financial Officer
Carl A. Zanoni ...................    54       Vice President, Research, Development and
                                                 Engineering and Director
William H. Bacon .................    46       Director of Total Quality
Robert B. Lynch ..................    43       Director of Operations
George A. Neale ..................    46       General Manager, Customer Support
Robert A. Smythe .................    43       Director of Sales & Marketing
Michael C. Thomas ................    37       Operations Manager, Optics
Joe J. Wallace ...................    39       General Manager, Flying Height Test Division
Paul F. Forman ...................    61       Chairman of the Board
Michael R. Corboy(2)(3) ..........    65       Director
Seymour E. Liebman(1)(2)(3) ......    46       Director
Robert G. McKelvey(1)(2)(3) ......    58       Director
Paul W. Murrill(4) ...............    61       Director
Robert B. Taylor(4) ..............    48       Director
    

- ---------------
<FN>
                                     
(1)  Nominating Committee member.

(2)  Compensation Committee member.

(3)  Amended and Restated Non-Qualified Stock Option Plan Committee member.

(4)  Audit Committee member.

</FN>
</TABLE>


     Gary K. Willis has served as a director of the Company since March 1992 and
has been President and Chief Executive Officer of the Company since August 1993.
From February 1992 until August 1993, he was President and Chief Operating
Officer of the Company. From October 1990 until January 1992, Mr. Willis was an
independent consultant. Prior to October 1990, he was the Chairman, President
and Chief Executive Officer of The Foxboro Company, a manufacturer of process
control equipment.

     Mark J. Bonney has served as Vice President, Finance and Administration and
Chief Financial Officer of the Company since March 1993 and Treasurer of the
Company since November 1993. From October 1990 until February 1993, he was Vice
President European Operations and Managing Director, Dynapert Limited, a Black &
Decker company, which was involved in the design and manufacture of printed
circuit board and semiconductor manufacturing equipment.

     Carl A. Zanoni has served as a director of the Company since its inception
in 1970 and has been Vice President, Research, Development and Engineering of
the Company since April 1992. From February 1989 until March 1992, he was Vice
President, Research and Development and Chief Scientist of the Company and from
June 1970 until February 1989, he was Vice President, Engineering of the
Company.

     William H. Bacon has been Director of Total Quality at the Company since
November 1993. From June 1987 to November 1993, he was the Manager of Instrument
Manufacturing Engineering for the Company.

     Robert B. Lynch has been Director of Operations of the Company since
December 1987. From October 1984 to November 1987, he was Manager of
Operations Planning of the Company. Mr. Lynch was Materials Manager, Trent

                                       29

<PAGE>

Tube Division at Colt Industries, a manufacturer of welded stainless steel and
alloy tubing, from November 1979 to October 1984.

     George A. Neale has been General Manager, Customer Support at the Company
since July 1991. From May 1984 to July 1991, he was the Product Service Manager
of the Company.

     Robert A. Smythe has been Director of Sales and Marketing of the Company
since June 1993. From April 1992 to June 1993, he served as Manager, Industry
Marketing and from July 1988 to April 1992, he was Director of Engineering and
Co-Product Line Manager for the Microscope and Large Aperture System product
line.

     Michael C. Thomas has been Operations Manager, Optics of the Company since
April 1994. From September 1985 until April 1994, he was Materials Supervisor
for the optical components division.

     Joe J. Wallace has been General Manager, Flying Height Test Division since
joining the Company in January 1995. From July 1994 to October 1994, Mr. Wallace
was the President of Cambrian Pacific Technologies, Inc. ("Cambrian"), a
division of Cambrian Systems, Inc.; from October 1993 to July 1994, he was Vice
President, Engineering of Cambrian; and from July 1992 to October 1993, he
served as Director of Product Development at Cambrian. Mr. Wallace served as the
President and Chief Operating Officer of ALP Engineering Group, Inc. from April
1989 to July 1992.

     Paul F. Forman has served as the Chairman of the Board of Directors of the
Company since its inception in 1970, and was the Chief Executive Officer of the
Company from June 1970 to August 1993, the Treasurer from June 1970 to November
1993, Acting President from June 1991 to February 1992 and Secretary from
March 1992 to November 1993.

     Michael R. Corboy has served as a director of the Company since April 1993.
Mr. Corboy is currently President and Chief Executive Officer of Corboy
Investment Company, positions he has held since January 1992. From December 1987
until December 1991, he served as Chairman and Chief Executive Officer of Amtech
Corporation, a manufacturer of vehicle identification equipment. Mr. Corboy is
currently the director of Networth, Inc., a software development company, and
Wyle Electronics, a distributor of electronic components.

     Seymour E. Liebman has served as a director of the Company since March
1993. Mr. Liebman is currently the Senior Vice President, Finance and General
Counsel of Canon U.S.A., Inc., positions he has held since January 1992. From
January 1990 until December 1991, he served as Vice President, Finance and
General Counsel of Canon U.S.A., Inc.

     Robert G. McKelvey has served as a director of the Company since August
1983. Mr. McKelvey has been the Chairman and President of George McKelvey Co.,
Inc., an investment advisor and securities broker-dealer, since 1976.
   
     Paul W. Murrill has served as a director of the Company since November
1993. Mr. Murrill has been independently employed as a professional engineer
since 1988. Mr. Murrill is currently a director of Entergy Corporation, a public
utility, Tidewater, Inc., an oil service company, First Mississippi Corporation,
a chemical fertilizer company, Piccadilly Cafeterias, Inc., a food service
company, Howell Corporation, a diversified energy company, and various
foundations and public service organizations.
    
     Robert B. Taylor has served as a director of the Company since August 1988.
Mr. Taylor has been Vice President and Treasurer of Wesleyan University since
April 1985. Mr. Taylor is currently a director of Middlesex Mutual Assurance
Co., a Connecticut-based property and casualty insurance company, and Farmers
and Mechanics Bank.

                                       30

<PAGE>


                       PRINCIPAL AND SELLING STOCKHOLDERS

     The following table sets forth, as of October 1, 1995, and as adjusted to
reflect the sale of the shares of Common Stock in this offering, certain
information with respect to the beneficial ownership of the Company's Common
Stock by (i) each person or entity known by the Company to own beneficially more
than 5% of the Company's Common Stock, (ii) each director of the Company, (iii)
all executive officers and directors as a group and (iv) the Selling
Stockholders. Except as indicated by footnote, the persons or entities named in
the table below have sole voting and investment power with respect to all shares
of Common Stock shown as beneficially owned by them.

<TABLE>
<CAPTION>

                                                    Shares Beneficially                   Shares Beneficially
                                                     Owned Before the                       Owner After the
                                                       Offering (1)          Shares            Offering
                                                    -------------------       Being       --------------------
                                                     Number    Percent       Offered      Number      Percent
                                                    -------    -------       -------      ------      -------
<S>                                                 <C>         <C>          <C>          <C>           <C>
Canon Inc. (1) ................................     786,000     20.0%        300,000      486,000       10.2%
Wesleyan University (2) .......................     397,500     10.1         225,000      172,500        3.6
Paul F. Forman (3) ............................     273,060      6.9          75,000      198,060        4.1
Sol F. Laufer (4) .............................     213,810      5.4          70,000      143,810        3.0
Carl A. Zanoni (3) ............................     289,110      7.3          60,000      229,110        4.8
Gary K. Willis (3) ............................     155,250      3.9             --       155,250        3.2
Robert G. McKelvey (3) ........................      53,100      1.3          25,000       28,100        *
Michael R. Corboy (3) .........................      21,000      *               --        21,000        *
Paul W. Murrill (3) ...........................      14,250      *               --        14,250        *
Robert B. Taylor (5) ..........................       9,750      *               --         9,750        *
Seymour E. Liebman (6) ........................       7,500      *               --         7,500        *
All executive officers and directors
  as a group (9 persons)(7) ...................     844,770     20.4         160,000      684,770       13.7

- ------------


*    Less than 1.0%.
                                                          
(1)  Shares of Common Stock beneficially owned prior to and after the offering
     and the percentage of class of Common Stock beneficially owned after the
     offering does not include shares of Common Stock beneficially owned by
     Seymour E. Liebman, Senior Vice President Finance and General Counsel of
     Canon U.S.A., Inc., an affiliate of Canon Inc. and a director of the
     Company.

(2)  Shares of Common Stock beneficially owned prior to and after the offering
     and the percentage of class of Common Stock beneficially owned after the
     offering does not include shares of Common Stock beneficially owned by
     Robert B. Taylor, Vice President and Treasurer of Wesleyan University and a
     director of the Company.
   
(3)  Shares of Common Stock beneficially owned prior to and after the offering
     and the percentage of class of Common Stock beneficially owned after the
     offering includes 39,000 shares for Mr. Forman, 36,450 shares for Mr.
     Zanoni, 56,250 shares for Mr. Willis, 7,500 shares for Mr. McKelvey, 13,500
     shares for Mr. Corboy and 13,500 shares for Mr. Murrill, all of which may
     be acquired within 60 days of October 1, 1995 upon the exercise of
     options.
    
(4)  Shares of Common Stock beneficially owned prior to and after the offering
     and the percentage of class of Common Stock beneficially owned after the
     offering includes 45,750 shares of Common Stock which may be acquired by
     Mr. Laufer within 60 days of October 1, 1995 upon the exercise of options.
     Mr. Laufer was Vice President, Optics Group of the Company through June
     1994.

(5)  Shares of Common Stock beneficially owned prior to and after the offering
     and the percentage of class of Common Stock beneficially owned after the
     offering includes 7,500 shares of Common Stock which may be acquired by Mr.
     Taylor within 60 days of October 1, 1995 upon the exercise of options. Does
     not include 397,500 shares owned by Wesleyan University.

(6)  Shares of Common Stock beneficially owned prior to and after the offering
     and the percentage of class of Common Stock beneficially owned after the
     offering includes 7,500 shares of Common Stock which may be acquired by Mr.
     Liebman within 60 days of October 1, 1995 upon the exercise of options.
     Does not include 786,000 shares owned by Canon Inc.

(7)  Shares of Common Stock beneficially owned prior to and after the offering
     and the percentage of class of Common Stock beneficially owned after the
     offering includes an aggregate of 202,950 shares of Common Stock which may
     be acquired by executive officers and directors of the Company within 60
     days of October 1, 1995 upon the exercise of options. Does not include
     786,000 and 397,500 shares owned by Canon Inc. and Wesleyan University,
     respectively, prior to the offering and 486,000 and 172,500 shares owned by
     Canon Inc. and Wesleyan University, respectively, after the offering.


</TABLE>
                                       31

<PAGE>

Material Relationships of Certain Selling Stockholders with the Company

     Canon Sales Co., Inc., a subsidiary of Canon Inc., serves as the exclusive
distributor of the Company's products in Japan. Sales to Canon aggregated $9.6
million and $7.7 million for the fiscal years ended 1995 and 1994, respectively.
Selling prices were based, generally, on the normal terms given to domestic
distributors. In addition, the Company and Canon have entered into agreements
providing for confidential exchanges of certain technology. The Company has
received royalty payments from Canon under certain of those agreements, which
payments, in the aggregate, are not material. The Company has also entered into
certain research and development contracts with Canon, pursuant to which the
Company has received funding.

     On June 23, 1995, the Company's Board of Directors approved the purchase of
approximately 22 acres of land adjacent to the Company's facility in
Middlefield, Connecticut, for a purchase price of $440,000. This land, which is
jointly owned by Paul F. Forman, Chairman of the Board of the Company, Sol F.
Laufer, a founder and former executive officer of the Company, and Carl A.
Zanoni, Vice President, Research, Development and Engineering and a director of
the Company, will facilitate expansion of the Company's buildings and/or parking
facilities in the future. The purchase is expected to occur during the quarter
ending March 31, 1996.

     In October 1983, Canon, Wesleyan University and the group consisting of
Messrs. Forman, Zanoni and Laufer entered into a Shareholders' Agreement
pursuant to which they agreed to vote their shares of Common Stock for the
election to the Company's Board of Directors of two directors designated by
Canon, Wesleyan University and the foregoing individuals as a group, and up to
five additional directors who were to be independent of the foregoing
stockholders. On November 30, 1993, the Shareholders' Agreement was terminated.

     In November 1993, a Registration Rights Agreement was entered into by the
Company, Wesleyan University, Canon and Messrs. Forman, Zanoni and Laufer. In
general, the Registration Rights Agreement grants to each of these stockholders
the right, until November 30, 1998, to have his or its shares of Common Stock
included in any registered public offering of the Company's securities. Each of
the parties to the Registration Rights Agreement has waived all rights to
include any additional shares of Common Stock owned by such person in the
Registration Statement of which this Prospectus is a part.

     In August 1993, the Company entered into a Services Agreement with each of
Mr. Forman and Mr. Laufer providing for their retention as an executive officer
of the Company through the end of the 1994 fiscal year and thereafter as a
consultant to the Company for an additional five years, in the case of Mr.
Forman, and an additional four years in the case of Mr. Laufer. Pursuant to his
agreement, Mr. Forman received a salary payment of $148,271 for the year of
employment, a one-time payment of $149,500 upon his termination from active
employment, and will continue to receive a $20,000 retainer for board service
for each of the five years of his consultancy plus 80%, 60%, 40% and 20% of his
salary at June 30, 1994 for each of the first through fourth years of his
consultancy, respectively. Pursuant to his agreement, Mr. Laufer received salary
payments of $133,586 for the year of employment, a one-time payment of $135,000
upon the termination of his employment, and will continue to receive payments of
80%, 60%, 40% and 20% of his salary at June 30, 1994 for each of the first
through fourth years of his consultancy, respectively. The Services Agreements
provided that all of Messrs. Forman and Laufer's outstanding unvested stock
options from the Company would become vested effective at the conclusion of the
fiscal year ended June 30, 1994 (consisting of options for 20,475 shares of
Common Stock in the case of Mr. Forman and 24,487 shares of Common Stock in the
case of Mr. Laufer). The Services Agreements are terminable (with all payment
obligations thereunder terminating) by Mr. Forman or Mr. Laufer, as the case may
be, at any time, and by the Company upon the death or disability of Mr. Forman
or Mr. Laufer or for justifiable cause (as defined in the Services Agreements);
except that if a Services Agreement terminates as a result of the death or
disability of Mr. Forman or Mr. Laufer, as the case may be, he (or his estate)
will be entitled to receive the lesser of twice his June 30, 1994 salary or the
aggregate remaining compensation payments otherwise required to be made under
the respective Services Agreement.

                                       32

<PAGE>

                                  UNDERWRITING

     Subject to the terms and conditions of the Underwriting Agreement (a copy
of which is filed as an exhibit to the Registration Statement of which this
Prospectus is a part), the Underwriters named below have severally agreed to
purchase from the Company and the Selling Stockholders the following number of
shares of Common Stock at the public offering price less the underwriting
discounts and commissions set forth on the cover page of this Prospectus:

                                                                    Number of
       Underwriter                                                    Shares
       -----------                                                  ---------

Alex. Brown & Sons Incorporated ...............................
Needham & Company, Inc. .......................................
Unterberg Harris ..............................................
                                                                    ---------
    Total .....................................................     1,600,000
                                                                    =========

     The Underwriting Agreement provides that the obligations of the
Underwriters are subject to certain conditions precedent and that the
Underwriters will purchase all shares of the Common Stock offered hereby if any
of such shares are purchased.

     The Company and the Selling Stockholders have been advised by the
Representatives of the Underwriters that the Underwriters propose to offer the
shares of Common Stock to the public at the public offering price set forth on
the cover page of this Prospectus. The Underwriters may allow a concession not
in excess of $  per share to certain dealers. After the offering, the offering
price and other selling terms may be changed by the Representatives of the
Underwriters.

     The Company has granted to the Underwriters an option, exercisable not
later than 30 days from the date of this Prospectus, to purchase up to 240,000
additional shares of Common Stock at the public offering price less the
underwriting discounts and commissions set forth on the cover page of this
Prospectus. To the extent that the Underwriters exercise such option, each of
the Underwriters will have a firm commitment to purchase approximately the same
percentage thereof that the number of shares of Common Stock to be purchased by
it shown in the above table bears to 1,600,000 and the Company will be
obligated, pursuant to the option, to sell such shares to the Underwriters. The
Underwriters may exercise such option only to cover over-allotments made in
connection with the sale of Common Stock offered hereby. If purchased, the
Underwriters will offer such additional shares on the same terms as those on
which the 1,600,000 shares are being offered.

     The Underwriting Agreement contains covenants of indemnity and contribution
among the Underwriters, the Company and the Selling Stockholders against certain
civil liabilities, including liabilities under the Securities Act of 1933, as
amended.

     The Company and its officers and directors, including the Selling
Stockholders, have agreed not to offer, sell or otherwise dispose of any
additional shares of Common Stock for a period of 90 days after the date of this
Prospectus without the prior written consent of Alex. Brown & Sons Incorporated,
provided that the Company may issue, and grant options to purchase, shares of
Common Stock under its existing stock option plans, and provided further that
certain Selling Stockholders may sell up to an aggregate of 7,500 shares of
Common Stock upon the exercise of stock options.

     The rules of the Securities and Exchange Commission (the "Commission")
generally prohibit the Underwriters and other members of the selling group, if
any, from making a market in the Common Stock during the "cooling-off" period
immediately preceding the commencement of sales in the offering. The Commission
has, however, adopted an exemption from these rules that permits passive market
making under certain conditions. These rules permit an Underwriter or other
member of the selling group, if any, to continue to make a market in the Common
Stock subject to the conditions, among others, that its bid not exceed the
highest bid by a market maker not connected with the offering and that its net
purchases on any one trading day not exceed prescribed limits. Pursuant to these
exemptions, certain Underwriters and other members of the selling group, if any,
may engage in passive market making in the Common Stock during the cooling-off
period.

                                       33

<PAGE>

                                  LEGAL MATTERS
   
     The validity of the shares of Common Stock offered hereby will be passed
upon for the Company by Fulbright & Jaworski L.L.P, New York, New York, and
certain legal matters will be passed upon for the Underwriters by Piper &
Marbury L.L.P., New York, New York. Paul Jacobs, a partner in Fulbright &
Jaworski L.L.P., is Secretary of the Company and, as of December 5, 1995,
beneficially owned 7,500 shares of Common Stock.
    
                                     EXPERTS

     The consolidated financial statements of the Company as of June 30, 1995
and 1994 and for each of the years in the three-year period ended June 30, 1995
have been included herein and in the registration statement in reliance upon the
report of KPMG Peat Marwick LLP, independent certified public accountants, upon
the authority of said firm as experts in accounting and auditing.

                              AVAILABLE INFORMATION

     The Company is subject to the informational requirements of the Securities
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance
therewith files reports, proxy statements, and other information with the
Commission. Such reports, proxy statements and other information can be
inspected and copied at the public reference facilities of the Commission at
Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549-1004; and at the
Commission's regional offices at Northwestern Atrium Center, Suite 1400, 500
West Madison Street, Chicago, Illinois 60661 and Suite 1300, Seven World Trade
Center, New York, New York 10048. Copies of such material can also be obtained
from the Public Reference Section of the Commission at 450 Fifth Street, N.W.,
Washington, D.C. 20549 at prescribed rates.

     The Company has filed with the Commission a Registration Statement under
the Securities Act of 1933, as amended (the "Securities Act"), with respect to
the Common Stock. This Prospectus does not contain all the information set forth
in the Registration Statement, certain portions of which have been omitted as
permitted by the rules and regulations of the Commission. For further
information with respect to the Company and the Common Stock, reference is made
to the Registration Statement, including the exhibits thereto. The Registration
Statement may be inspected by anyone without charge at the principal office of
the Commission in Washington, D.C., and copies of all or any part of it may be
obtained from the Commission upon payment of the prescribed fees.

                 INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents, which are on file with the Commission (File No.
0-12944), are incorporated in this Prospectus by reference and made a part
hereof:

          (a) The Company's Annual Report on Form 10-K for the fiscal year ended
     June 30, 1995.

          (b) The Company's Current Report on Form 8-K, dated July 20, 1995,
     filed on July 20, 1995.

          (c) The Company's Current Report on Form 8-K, dated August 22, 1995,
     filed on August 23, 1995.

          (d) The Company's Quarterly Report on Form 10-Q for the fiscal quarter
     ended September 30, 1995.

          (e) The description of the Company's Common Stock contained in Item 1
     of the Company's Registration Statement on Form 8-A, dated October 26,
     1984.

     All documents filed by the Company pursuant to Section 13(a), 13(c), 14 or
15(d) of the Exchange Act subsequent to the date of this Prospectus and prior to
the termination of this offering shall be deemed to be incorporated by reference
into this Prospectus and to be a part hereof from the respective dates of filing
of such documents. Any statement contained in a document incorporated or deemed
to be incorporated by reference herein shall be deemed to be modified or
superseded for all purposes to the extent that a statement contained in this
Prospectus or any other subsequently filed document that is also incorporated by
reference herein modifies or supersedes such statement. Any such statements so
modified or superseded shall not be deemed, except as so modified or superseded,
to constitute a part of this Prospectus.

     The Company will provide without charge to each person to whom this
Prospectus is delivered, upon written or oral request of such person, a copy of
any or all of the foregoing documents incorporated herein by reference (other
than exhibits to such documents, unless such exhibits are specifically
incorporated by reference into such documents). Written or telephone requests
should be directed to Zygo Corporation, Laurel Brook Road, Middlefield,
Connecticut 06455-0448, Attention: Mark J. Bonney, Vice President, Finance and
Administration, (860) 347-8506.

     The Company furnishes its stockholders with an annual report containing
audited financial statements. In addition, the Company may furnish such other
reports as may be authorized, from time to time, by the Board of Directors.

                                       34
<PAGE>

                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

                                                                            Page
                                                                            ----
Report of Independent Auditors............................................   F-2

Financial Statements:
  Consolidated Balance Sheets ............................................   F-3
  Consolidated Statements of Earnings ....................................   F-4
  Consolidated Statements of Stockholders' Equity ........................   F-5
  Consolidated Statements of Cash Flow ...................................   F-6
  Notes to Consolidated Financial Statements .............................   F-7

                                      F-1
<PAGE>


                         REPORT OF INDEPENDENT AUDITORS

The Board of Directors and Stockholders of
   Zygo Corporation:

     We have audited the accompanying consolidated balance sheets of Zygo
Corporation and consolidated subsidiary as of June 30, 1995 and 1994, and the
related consolidated statements of earnings, stockholders' equity and cash flows
for each of the years in the three-year period ended June 30, 1995. These
consolidated financial statements are the responsibility of the Company's
management. Our responsibility is to express an opinion on these consolidated
financial statements based on our audits.

     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

     In our opinion, the consolidated financial statements referred to above
present fairly, in all material respects, the financial position of Zygo
Corporation and consolidated subsidiary as of June 30, 1995 and 1994, and the
results of their operations and their cash flows for each of the years in the
three-year period ended June 30, 1995, in conformity with generally accepted
accounting principles.

                                                           KPMG PEAT MARWICK LLP

Hartford, Connecticut
August 11, 1995

                              F-2
<PAGE>
                  
<TABLE>

                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

                           CONSOLIDATED BALANCE SHEETS
                 (Thousands, except share and per share amounts)

                                     ASSETS
<CAPTION>

                                                                         June 30,   June 30,  September 30,
                                                                           1994       1995        1995
                                                                        --------   ---------  -------------
                                                                                               (unaudited)
<S>                                                                     <C>         <C>         <C>
Current assets:
  Cash and cash equivalents .........................................   $  2,530    $  2,428    $  1,523
  Marketable securities (note 2) ....................................      7,874       7,746       7,342
  Receivables:
    Trade (note 11) .................................................      4,028       6,092       7,768
    Other ...........................................................         81         204         217
                                                                        --------    --------    --------
     Total receivables ..............................................      4,109       6,296       7,985
                                                                        --------    --------    --------
  Inventories:
    Raw materials and manufactured parts.............................      1,563       2,863       2,863
    Work in process .................................................      1,236       2,281       2,689
    Finished goods ..................................................        454         499         522
                                                                        --------    --------    --------
     Total inventories ..............................................      3,253       5,643       6,074
                                                                        --------    --------    --------
  Prepaid expenses and taxes ........................................        268         581         663
  Deferred income taxes (note 9) ....................................        825       1,043       1,104
                                                                        --------    --------    --------
     Total current assets ...........................................     18,859      23,737      24,691
                                                                        --------    --------    --------
Property, plant and equipment, at cost:
  Land ..............................................................        206         206         206
  Building ..........................................................      3,985       4,300       4,411
  Machinery, equipment and office furniture .........................     10,881      11,984      12,171
  Construction in progress ..........................................        491         154         260
                                                                        --------    --------    --------
    Gross property, plant and equipment .............................     15,563      16,644      17,048
  Less accumulated depreciation .....................................     10,483      11,381      11,641
                                                                        --------    --------    --------
    Net property, plant and equipment ...............................      5,080       5,263       5,407
                                                                        --------    --------    --------
Other assets, net ...................................................        560         666         669
                                                                        --------    --------    --------
Total assets ........................................................   $ 24,499    $ 29,666    $ 30,767
                                                                        ========    ========    ========

                      LIABILITIES AND STOCKHOLDERS' EQUITY

   
Current liabilities:
  Accounts payable ..................................................   $  1,155    $  2,515    $  2,325
  Customer progress payments ........................................        166         174         142
  Accrued salaries and wages ........................................      1,582       1,957       1,900
  Other accrued expenses ............................................        892       1,366       1,625
  Income taxes payable ..............................................       --           653         667
  Current portion of long-term debt (note 4) ........................        175        --          --
                                                                        --------    --------    --------
    Total current liabilities .......................................      3,970       6,665       6,659
                                                                        --------    --------    --------
Long-term debt, excluding current portion (note 4) ..................        481        --          --
Deferred income taxes (note 9) ......................................        655         668         665
Deferred liabilities ................................................        119        --          --
Stockholders' equity (notes 6, 7, and 8):
  Common stock, $.10 par value per share: 10,000,000 shares
    authorized; 3,992,558 shares issued at June 30, 1994;
    4,030,786 shares issued at June 30, 1995; 4,037,686 shares
    issued at September 30 1995 .....................................        266         403         404
  Additional paid-in capital ........................................     10,484      10,726      10,748
  Retained earnings .................................................      8,893      11,508      12,598
  Net unrealized loss on marketable securities (note 2) .............        (68)         (3)         (6)
                                                                        --------    --------    --------
                                                                          19,575      22,634      23,744
  Less treasury stock, at cost; 103,800 common shares ...............        301         301         301
                                                                        --------    --------    --------
    Total stockholders' equity ......................................     19,274      22,333      23,443
                                                                        --------    --------    --------
Total liabilities and stockholders' equity ..........................   $ 24,499    $ 29,666    $ 30,767
                                                                        ========    ========    ========
    


</TABLE>

          See accompanying notes to consolidated financial statements.

                                      F-3

<PAGE>

<TABLE>

                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

                       CONSOLIDATED STATEMENTS OF EARNINGS
                      (Thousands, except per share amounts)
<CAPTION>
                                                                                                                 Three Months
                                                                     Fiscal Year Ended June 30,               Ended September 30,
                                                               --------------------------------------       ------------------------
                                                                 1993           1994           1995           1994           1995
                                                               --------       --------       --------       --------       --------
                                                                                                                   (unaudited)
<S>                                                             <C>           <C>            <C>            <C>            <C>

Net sales (note 11) .....................................      $ 22,702       $ 24,141       $ 32,233       $  5,858       $ 11,341
Cost of goods sold ......................................        13,653         13,525         18,002          3,454          6,337
                                                               --------       --------       --------       --------       --------
   Gross profit .........................................         9,049         10,616         14,231          2,404          5,004
Selling, general and administrative expenses ............         5,998          6,675          6,537          1,500          1,960
Research, development and engineering expenses ..........         3,077          2,786          3,967            669          1,426
                                                               --------       --------       --------       --------       --------
   Operating profit (loss) ..............................           (26)         1,155          3,727            235          1,618
                                                               --------       --------       --------       --------       --------
Other income (expense):
 Interest income ........................................           379            338            372             88            101
 Interest expense .......................................           (69)           (51)           (40)           (12)          --
 Miscellaneous income (expense), net (note 12) ..........           414           (114)          (103)           (63)           (41)
                                                               --------       --------       --------       --------       --------
   Total other income ...................................           724            173            229             13             60
                                                               --------       --------       --------       --------       --------
   Earnings before income taxes .........................           698          1,328          3,956            248          1,678
Income tax expense (note 9) .............................           217            410          1,207             92            588
                                                               --------       --------       --------       --------       --------
Net earnings ............................................      $    481       $    918       $  2,749       $    156       $  1,090
                                                               ========       ========       ========       ========       ========
Earnings per common and common equivalent
 share (note 7) .........................................      $    .12       $    .23       $    .65       $    .04       $    .23
                                                               ========       ========       ========       ========       ========
Weighted average common shares and common
 dilutive equivalents outstanding (note 7) ..............         3,902          3,987          4,242          3,971          4,670
                                                               ========       ========       ========       ========       ========

</TABLE>

          See accompanying notes to consolidated financial statements.

                                      F-4
<PAGE>

<TABLE>

                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

                 CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                             (Thousands of dollars)
<CAPTION>

                                                                                            Unrealized
                                                                                              Gain
                                                                    Additional              (Loss) on                     Total
                                                        Common       Paid-In     Retained   Marketable     Treasury    Stockholders'
                                                        Stock        Capital     Earnings   Securities      Stock         Equity
                                                       --------     --------     --------   ----------     --------    -----------
<S>                                                    <C>          <C>          <C>           <C>         <C>           <C>

Balance at June 30, 1992 .........................     $    261     $ 10,266     $  7,494      $   --      $   (301)     $ 17,720
 Net earnings ....................................         --           --            481          --          --             481
 Exercise of employee stock options ..............            5          210         --            --          --             215
                                                       --------     --------     --------      -------     --------      --------
Balance at June 30, 1993 .........................          266       10,476        7,975          --          (301)       18,416
 Net earnings ....................................         --           --            918          --          --             918
 Net unrealized loss on marketable
  securities, net of related tax effect ..........         --           --           --             (68)       --             (68)
 Exercise of employee stock options ..............         --              8         --            --          --               8
                                                       --------     --------     --------      --------    --------      --------
Balance at June 30, 1994 .........................          266       10,484        8,893           (68)       (301)       19,274
 Net earnings ....................................         --           --          2,749          --          --           2,749
 Net unrealized gain on marketable
  securities, net of related tax effect ..........         --           --           --              65        --              65
 Exercise of employee stock options ..............            3          242         --            --          --             245
 Stock split (note 7) ............................          134         --           (134)         --          --            --
                                                       --------     --------     --------      --------    --------      --------
Balance at June 30, 1995 .........................          403       10,726       11,508            (3)       (301)       22,333
 Net earnings (unaudited) ........................         --           --          1,090          --          --           1,090
 Net unrealized gain on marketable
  securities, net of related tax effect (unaudited)        --           --           --              (3)       --              (3)
 Exercise of employee stock options
  (unaudited) ....................................            1           22         --            --          --              23
                                                       --------     --------     --------      --------    --------      --------
Balance at September 30, 1995
  (unaudited) ....................................     $    404     $ 10,748     $ 12,598      $     (6)   $   (301)     $ 23,443
                                                       ========     ========     ========      ========    ========      ========

</TABLE>

          See accompanying notes to consolidated financial statements.

                                       F-5

<PAGE>

<TABLE>
                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

                      CONSOLIDATED STATEMENTS OF CASH FLOWS
                             (Thousands of dollars)
<CAPTION>

                                                                                                               Three Months Ended
                                                                          Fiscal Year Ended June 30,              September 30,
                                                                    -----------------------------------       ----------------------
                                                                      1993          1994         1995          1994          1995
                                                                    -------       -------       -------       -------       -------
                                                                                                                   (unaudited)
<S>                                                                 <C>           <C>           <C>           <C>           <C>

Cash provided by (used for) operating activities:
 Net earnings ................................................      $   481       $   918       $ 2,749       $   156       $ 1,090
 Adjustments to reconcile net earnings to cash
  provided by operating activities:
   Depreciation and amortization .............................        1,270         1,348         1,248           285           336
   Deferred income taxes .....................................          (45)         (427)         (248)         --             (63)
   Loss on disposal of assets ................................            4           205           251            36             2
   Gain on sale of marketable securities .....................         --             (49)         --            --            --
   Intangible and other assets ...............................          (37)          (29)         --            (103)         --
   Other .....................................................           92          --            --            --            --

   Changes in operating accounts:
    Receivables ..............................................          316           500        (2,220)          (22)       (1,669)
    Inventories ..............................................        1,969          (204)       (2,387)         (345)         (431)
    Prepaid expenses and taxes ...............................          (58)          (99)         (313)           (1)          (82)
    Accounts payable and accrued expenses ....................           98          (633)        2,751          (309)           (6)
                                                                    -------       -------       -------       -------       -------
   Net cash provided by (used for)
    operating activities .....................................        4,090         1,530         1,831          (303)         (823)
                                                                    -------       -------       -------       -------       -------
Cash provided by (used for) investing activities:
 Additions to property, plant, and equipment .................         (910)       (1,912)       (1,631)         (412)         (474)
 Investment in marketable securities .........................       (7,340)       (4,725)       (1,229)         (496)         --
 Investment in other assets ..................................         --            --             (39)         --             (31)
 Acquisition of business .....................................         --            --            (100)         --            --
 Proceeds from the sale of marketable securities .............         --           3,777          --            --            --
 Proceeds from maturity of marketable securities .............         --             350         1,465           785           400
 Proceeds from sale of assets ................................         --            --              12          --            --
                                                                    -------       -------       -------       -------       -------
   Net cash used for investing activities ....................       (8,250)       (2,510)       (1,522)         (123)         (105)
                                                                    -------       -------       -------       -------       -------
Cash provided by (used for) financing activities:
 Repayments of long-term debt ................................         (305)         (179)         (656)          (44)         --
 Exercise of employee stock options ..........................          215             8           245            13            23
                                                                    -------       -------       -------       -------       -------
   Net cash provided by (used for)
    financing activities .....................................          (90)         (171)         (411)          (31)           23
                                                                    -------       -------       -------       -------       -------
Net decrease in cash and cash equivalents ....................       (4,250)       (1,151)         (102)         (457)         (905)
Cash and cash equivalents, beginning of year .................        7,931         3,681         2,530         2,530         2,428
                                                                    -------       -------       -------       -------       -------
Cash and cash equivalents, end of period .....................      $ 3,681       $ 2,530       $ 2,428       $ 2,073       $ 1,523
                                                                    =======       =======       =======       =======       =======

</TABLE>

          See accompanying notes to consolidated financial statements.

                                      F-6
<PAGE>


                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

                          June 30, 1993, 1994, and 1995

(1) Summary of Significant Accounting Policies

     Principles of Consolidation--The consolidated financial statements include
the accounts of the Company and its wholly owned Foreign Sales Corporation
("FSC") subsidiary. All material transactions and accounts with the subsidiaries
have been eliminated from the consolidated financial statements.

     The Company also owns 100% of Zygo Credit Corporation which was formed in
fiscal 1983. Activity of Zygo Credit Corporation has been insignificant to date.

     Cash and Cash Equivalents--The Company considers cash and cash investments
with maturities at the date of purchase of less than three months to be cash and
cash equivalents.

     Marketable Securities--The Company considers investments in securities with
maturities at the date of purchase in excess of three months as marketable
securities. Marketable securities primarily consist of tax-exempt municipal debt
securities. The Company adopted the provisions of Statement of Financial
Accounting Standards No. 115, Accounting for Certain Investments in Debt and
Equity Securities ("Statement 115") at June 30, 1994. The change in accounting
for Marketable Securities had no effect on retained earnings. All securities
held by the Company at June 30, 1993, 1994, and 1995, were classified as
available-for-sale and recorded at fair value. Unrealized holding gains and
losses, net of the related tax effect, on available-for-sale securities are
excluded from earnings and are reported as a separate component of stockholders'
equity until realized.

     Inventories--Inventories are stated at the lower of cost (determined on a
first-in, first-out basis) or market.

     Revenue Recognition--Sales, other than sales under long-term research and
development contracts, are recognized when units are shipped. Sales related to
long-term fixed-price research and development contracts are recognized under
the cost-to-cost percentage of completion method of accounting.

     Depreciation--Depreciation rates are based on the estimated useful lives of
the various classes of assets and are computed using the straight-line method.

     Research and Development Costs--Research and development costs are expensed
as incurred.

     Income Taxes--Effective July 1, 1992, the Company adopted Statement
of Financial Accounting Standards No. 109, Accounting for Income Taxes.
("Statement 109"). The cumulative effect of that change in the method of
accounting for income taxes in fiscal 1993 was not material.

     Earnings Per Share--Earnings per common and common equivalent share amounts
represent primary earnings per share and are based upon the weighted average
number of common shares outstanding, plus, when their effect is dilutive, the
weighted average number of shares issuable upon exercise of outstanding stock
options, less the weighted average number of common shares which could have been
repurchased with the proceeds available from the assumed exercise of the
outstanding options. Fully diluted earnings per share are not significantly
different from primary earnings per share.

     Gain Contingency--The Company was awarded $2,668,710 plus recovery of
certain costs in a judgment rendered by the United States District Court
(District of Arizona) on June 2, 1994. The Court's decision was appealed to the
Court of Appeals for the Federal Circuit located in Washington, D.C. by the
defendant and oral arguments of the appeal were heard by the Court on March 9,
1995. The Company has not and will not record any gain from the district court
judgment until a final determination of the award is made.

     Stock Split--Subsequent to fiscal 1995, the Board of Directors of the
Company declared a 3-for-2 split of the Company's common shares, effected in the
form of a 50% stock dividend paid on August 21, 1995, to shareholders of record
as of the close of business on August 1, 1995. All presentations involving
numbers of shares and amounts per share in 1995 and prior years have been
restated to reflect the stock split.

                                      F-7
<PAGE>

                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                          June 30, 1993, 1994, and 1995

(2) Marketable Securities

     Marketable securities at June 30, 1995, consist primarily of tax-exempt
bonds issued by various state and municipal agencies which are reported at fair
value. The unrealized loss on marketable securities of $4,889 (gross) is shown
net of its related tax effect of $1,956 as a separate component of stockholders'
equity.

     Dividend and interest income are recognized when earned. Realized gains and
losses are included in earnings and are derived using the specific
identification method for determining the cost of securities sold.

     The cost, gross unrealized holding gains, gross unrealized holding losses,
and fair value for available-for-sale securities at June 30, 1994, and June 30,
1995, were as follows:

                                                 Gross      Gross
                                              Unrealized Unrealized
                                                Holding    Holding       Fair
                                        Cost     Gains     Losses       Value
                                       ------    -----     ------      ------
                                                (Thousands of dollars)

At June 30, 1994 State and local
  municipal bonds .................    $7,987    $ --      $  113      $7,874
                                       ------    -----     ------      ------
At June 30, 1995 State and local
  municipal bonds .................    $7,751    $ --      $    5      $7,746
                                       ======    =====     ======      ======

     The Company recorded gross realized gains on the maturity of investment
securities of $135 in 1995. There were no gross realized losses recorded in
1994 or 1995.

     Maturities of investment securities classified as available-for-sale were
as follows at June 30, 1995.

                                                                         Fair
                                                           Cost          Value
                                                          ------        ------
                                                         (Thousands of dollars)
Due within one year ................................      $1,659        $1,657
Due after one year through five years ..............       6,092         6,089
                                                          ------        ------
                                                          $7,751        $7,746
                                                          ======        ======

(3) Bank Line of Credit

     The Company has a $3,000,000 unsecured bank line of credit with interest at
the bank's prime rate. The line of credit is available through November 30,
1995. At June 30, 1994, and June 30, 1995, no amounts were outstanding under the
bank line of credit.

(4) Long-Term Debt

     In the quarter ended March 31, 1995, the Company retired its 1977 and 1981
Series Industrial Development Bonds totaling $375,000 and $150,000,
respectively, prior to scheduled maturity. This transaction resulted in no
extraordinary gain or loss. The funds for these retirements were obtained from
internally generated cash flows.

     Interest payments were $69,900, $50,800, and $39,900 in fiscal 1993, 1994,
and 1995, respectively.

                                      F-8
<PAGE>
                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                          June 30, 1993, 1994, and 1995


(5) Profit-Sharing Plan

     The Company maintains a deferred profit-sharing plan under which
substantially all full-time employees of the Company are eligible to
participate. Profit-sharing expense for the years ended June 30, 1993, 1994, and
1995 amounted to $77,500, $147,500, and $440,000, respectively. Profit-sharing
contributions are determined annually at the discretion of the Board of
Directors.

     Effective June 30, 1985, the existing profit-sharing plan was revised and
amended to incorporate a 401(k) tax deferred payroll deduction program and an
Employee Stock Ownership Program. Under the 401(k), employees may contribute a
tax deferred amount of up to 15% of their compensation, as defined. The Company
may contribute an amount to the 401(k) which amount is determined annually at
the discretion of the Board of Directors. The 401(k) contribution expense for
the years ended June 30, 1993, 1994, and 1995 amounted to $152,200, $146,400,
and $255,000, respectively.

     Under the Employee Stock Ownership Program, the Company may, at the
discretion of the Board of Directors, contribute its own stock or cash to
purchase its own stock. Such stock's fair market value shall not exceed the
maximum amount of employee stock ownership credit as determined under Section
416 of the Internal Revenue Code. There were no purchases and no contributions
made under this program for the years ended June 30, 1993, 1994, and 1995.

(6) Stockholders' Agreements

     In November 1993, Canon Inc., Wesleyan University, Paul F. Forman, Carl A.
Zanoni, and Sol F. Laufer, and the Company terminated an agreement which had
been effective since December 1983 when the Company's registration statement for
the initial public offering of its Common Stock was declared effective. Under
that agreement, they had agreed among other things, to vote their shares for the
election to the Company's Board of Directors of two directors designated by each
of Canon Inc., Wesleyan University, and Paul F. Forman, Carl A. Zanoni, and Sol
F. Laufer, as a group. During the period that the agreement was in effect, the
voting requirements thereof effectively determined the outcome of the election
of all members of the Company's Board of Directors.

     At the time of the termination of the Stockholders' Agreement, a
Registration Rights Agreement was entered into by Canon Inc., Wesleyan
University, Paul F. Forman, Carl A. Zanoni, Sol F. Laufer, and the Company. In
general, the Registration Rights Agreement grants to each of these stockholders
the right, until November 30, 1998, to have his or its shares of Common Stock
included in any registered public offering of the Company's securities.

(7) Stockholders' Equity

     On July 20, 1995, the Board of Directors declared a 3-for-2 split effected
in the form of a 50% stock dividend payable on August 21, 1995, to shareholders
of record on August 1, 1995. This transaction resulted in the issuance of
approximately 1,309,000 additional shares of Common Stock. Stockholders' Equity
has been adjusted to recognize the effect of the stock split by reclassifying
from retained earnings to paid-in capital the par value of the additional shares
arising from the split. In addition, all references in the financial statements
to numbers of shares, per share amounts, stock option data, and market prices of
the Company's Common Stock have been restated to give retroactive recognition to
the stock split. On July 20, 1995, the Board of Directors approved an increase
in the authorized shares of the Company's Common Stock from 10,000,000 to
15,000,000 subject to shareholder approval.

                                      F-9

<PAGE>

                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                          June 30, 1993, 1994, and 1995


(8) Stock Options and Stock Ownership Plans

     On September 3, 1987, the Board of Directors adopted a non-qualified stock
option plan (the "Non-Qualified Plan") providing for non-qualified options to
purchase Common Stock of the Company and reserved 300,000 shares of Common Stock
for issuance upon the exercise of options under the Non-Qualified Plan. During
fiscal year 1990, the amount of shares reserved under the Non-Qualified Plan was
increased to 600,000. On August 26, 1992, the Board of Directors amended and
restated the Non-Qualified Plan and increased the amount of shares reserved to
975,000. On November 19, 1992, the Amended and Restated Non-Qualified Stock
Option Plan (the "Amended and Restated Non-Qualified Plan") was approved by the
Company's stockholders. At June 30, 1995, options to purchase 688,838 shares of
Common Stock, at prices of $2.50 to $13.83 per share, were outstanding under the
Amended and Restated Non-Qualified Plan of which options to purchase 264,525
shares were exercisable at prices of $2.50 to $5.17 per share. Options exercised
during fiscal 1993, 1994, and 1995 were 71,121 shares at $2.20 to $3.50 per
share; 2,588 shares at $2.83 to $3.83 per share; and 38,250 shares at $2.50 to
$4.00 per share, respectively. At June 30, 1995, there were 45,170 Common Shares
reserved for future issuance of stock options under the Amended and Restated
Non-Qualified Plan. On August 24, 1995, the Board of Directors approved an
increase in the number of shares authorized under this plan from 975,000 to
1,425,000, subject to shareholder approval.

     On August 25, 1994, the Board of Directors adopted a Non-Employee Director
Stock Option Plan providing for non-qualified options to purchase Common Stock
of the Company and reserved 300,000 shares of Common Stock for issuance upon the
exercise of options under the Non-Employee Director Stock Option Plan. At June
30, 1995, options to purchase 187,500 shares of Common Stock, at a price of
$4.00 per share, were outstanding under the Non-Employee Director Stock Option
Plan, none of which were then exercisable.

Interim (Unaudited)

     On August 24, 1995, the Company granted 2,000 options under the Amended and
Restated Non-Qualified Plan at an exercise price of $25.75 per share. Options to
purchase 682,887 shares of Common Stock, at prices of $2.50 to $25.75 per share,
were outstanding under the Amended and Restated Non-Qualified Plan as of
September 30, 1995.

(9) Income Taxes

     The components of income tax expense (benefit) for each year are as
follows:

<TABLE>
<CAPTION>


                                                                      Fiscal Year Ended June 30,
                                                                     ----------------------------
                                                                     1993         1994       1995
                                                                     ----         ----       ----

                                                                         (Thousands of dollars)

           Currently payable:
<S>                                                                    <C>         <C>      <C>

            Federal ..............................................     $169        $612     $1,036
            State ................................................       93         225        421
                                                                       ----        ----     ------
                                                                        262         837      1,457
                                                                       ----        ----     ------
           Deferred:

            Federal ..............................................      (29)       (290)      (188)
            State ................................................      (16)       (137)       (62)
                                                                       ----        ----     ------
                                                                        (45)       (427)      (250)
                                                                       ----        ----     ------
             Total income tax expense ............................     $217        $410     $1,207
                                                                       ====        ====     ======

</TABLE>


     During fiscal 1994, the Internal Revenue Service completed an examination
of the Company's fiscal 1991 U.S. federal income tax return. Adjustments to the
fiscal 1991 income tax return generated deferred tax benefits which the Company
has received or expects to receive in subsequent years.

     Income taxes paid amounted to $309,000, $1,185,000 (including additional
taxes owed for fiscal 1991) and $793,100 (including cash payments net of cash
refunds of $565,600 and $227,500 of prior year overpayments applied to fiscal
1995), in fiscal 1993, 1994, and 1995, respectively.

                                      F-10
<PAGE>
                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                          June 30, 1993, 1994, and 1995



     The total income tax expense differs from the amount computed by applying
the applicable U.S. federal income tax rate of 34% to earnings before income
taxes for the following reasons:

                                                    Fiscal Year Ended June 30,
                                                  -----------------------------
                                                    1993       1994       1995
                                                  -------    -------    -------
                                                       (Thousands of dollars)

Computed  "expected"  tax expense .............   $   237    $   451    $ 1,345
Increases (reductions) in taxes resulting from:
 State taxes, net of federal income tax benefit        51         57        237
 Tax exempt interest income ...................       (49)       (96)      (108)
 FSC benefit ..................................      --          (85)      (194)
 Adjustment of prior years' tax liabilities ...      --           75       --
 Other, net ...................................       (22)         8        (73)
                                                  -------    -------    -------
                                                  $   217    $   410    $ 1,207
                                                  =======    =======    =======

     The tax effects of temporary differences that give rise to significant
portions of the deferred tax assets and deferred tax liabilities as of June 30,
1994 and 1995, are presented below:

                                                           June 30,   June 30,
                                                             1994       1995
                                                           -------    -------
                                                          (Thousands of dollars)

Deferred tax assets:
 Accounts receivable, principally due to the allowance
  for doubtful accounts ................................   $    29    $    57
 Warranty costs ........................................        62        103
 Vacation costs ........................................       118        108
 Medical insurance costs ...............................       100        123
 Inventory allowance ...................................       442        581
 Restricted stock and deferred compensation expense ....        56         49
 Unrealized loss on marketable securities ..............        45          2
 Other .................................................        27         37
                                                           -------    -------
 Deferred tax assets ...................................       879      1,060
 Less valuation allowance ..............................      --         --
                                                           -------    -------
 Net deferred tax assets ...............................       879      1,060
Deferred tax liabilities:
Earnings from consolidated FSC subsidiary ..............       (16)      --
Insurance costs ........................................       (39)       (17)
Plant and equipment, principally due to differences
 in depreciation expense ...............................      (620)      (644)
Other ..................................................       (34)       (24)
                                                           -------    -------
Deferred tax liabilities ...............................      (709)      (685)
                                                           -------    -------
Net deferred tax asset .................................   $   170    $   375
                                                           =======    =======

                                      F-11

<PAGE>
                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                          June 30, 1993, 1994, and 1995


     The net current deferred tax assets and net noncurrent deferred tax
liabilities as recorded on the balance sheet as of June 30, 1994 and 1995, are
as follows:

                                                          June 30,      June 30,
                                                            1994          1995
                                                         -------        -------
                                                         (Thousands of dollars)
Net current deferred tax asset ...................       $   825        $ 1,043
Net noncurrent deferred tax liability ............          (655)          (668)
                                                         -------        -------
Net deferred tax asset ...........................       $   170        $   375
                                                         =======        =======

     A valuation allowance has not been recorded because the Company believes
that the deferred tax assets will, more likely than not, be realized. This
determination is based largely upon the Company's historical earnings trend as
well as its ability to carryback reversing items within three years to offset
taxes paid. In addition, the Company has the ability to offset deferred tax
assets against deferred tax liabilities associated with such items as
depreciation and amortization.

(10) Products, Principal Customers, and Operations by Geographic Area

     The Company designs, develops, manufactures, and markets high-performance
noncontact electro-optical measuring instruments and accessories, and
manufactures precision optical components. The firm is based in Middlefield,
Connecticut.

     Sales to Canon Inc. and to Canon Sales Co., Inc., accounted for more than
10% of total company sales for the years ended June 30, 1993, 1994, and 1995.
See note 11. In the year ended June 30, 1995, sales to a major manufacturer of
computer disk drives and related hardware and software, accounted for 17% of
total company sales. Sales to the University of Rochester of precision optical
components accounted for 12% of the company's consolidated sales for the year
ended June 30, 1993. No other individual customer accounted for more than 10% of
total company sales for any year presented in the accompanying consolidated
financial statements.

     Export sales by geographic area were as follows:

                                                 Fiscal Year Ended June 30,
                                         ---------------------------------------
                                           1993           1994             1995
                                         -------         -------         -------
                                                 (Thousands of dollars)
Far East
 Japan .........................         $ 4,647         $ 7,586         $ 9,630
 Pacific Rim ...................           2,389           2,129           3,279
                                         -------         -------         -------
Total Far East .................           7,036           9,715          12,909
Europe and other ...............           1,661           1,332           2,072
                                         -------         -------         -------
  Total ........................         $ 8,697         $11,047         $14,981
                                         =======         =======         =======

                                   F-12

<PAGE>
                  ZYGO CORPORATION AND CONSOLIDATED SUBSIDIARY

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(Continued)

                          June 30, 1993, 1994, and 1995



(11) Related Party Transactions

     Sales to Canon Inc., a major stockholder, and to Canon Sales Co., Inc., the
exclusive distributor for the Company's products in Japan and a subsidiary of
Canon Inc., amounted to approximately $4,647,000, $7,740,000, and $9,553,000,
for the years ended June 30, 1993, 1994, and 1995, respectively. Sales included
revenue amounts relating to a fixed price research and development contract in
the years ended June 30, 1993, and 1994 which was accounted for under the
cost-to-cost percentage of completion method. Such amounts were $1,360,000 and
$340,000 for the years ended June 30, 1993 and 1994, respectively.

     Selling prices of products sold to Canon Inc. and Canon Sales Co., Inc.,
are generally based on the normal terms given to distributors. At June 30, 1993,
1994, and 1995, there was approximately, in the aggregate, $870,460, $746,540,
and $1,104,700, respectively, of trade accounts receivable from Canon Inc. and
Canon Sales Co., Inc.

     On June 23, 1995, the Company's Board of Directors approved the purchase of
approximately 22 acres of land adjacent to the Company's facility in
Middlefield, Connecticut, for a purchase price of $440,000. The land, which is
jointly owned by Paul F. Forman, Sol F. Laufer, and Carl A. Zanoni, founders of
the Company, will facilitate expansion of the Company's buildings and/or parking
facilities in the future. The purchase is expected to occur during the quarter
ending March 31, 1996.

(12) Miscellaneous Income

     In the year ended June 30, 1993, the Company recorded $400,000 (pretax) of
income relating to its sale in June 1992 of the IMAGE Product Line, which was a
family of laser-based optical gauges. This amount, which was collected during
fiscal 1994, related to a contingent payment made by LaserMike, the purchaser of
the IMAGE line, for exceeding certain financial targets in the twelve-month
period following the sale.

                              F-13
<PAGE>

                              [INSIDE BACK COVER]


PRECISION SURFACE MANUFACTURING


                     (Picture of Several Optical Components)

           Several finished optical components after lightweighting.




       (Picture of optical machinist working on a large optical component.)

                   Machinist working a large glass component.




              (Picture of optical polishing machine and technician)

Polishing technician placing an optical component on the pitch lap of a 96" ring
polishing machine.




                  (Picture of tray of coated optical components)

           Many specialized optical coatings can be applied in-house.





LARGE-APERTURE SURFACE MEASUREMENT


     (Picture of large aperture interferometer system with GPI XP mainframe.)

          Large aperture interferometer system with GPI XP mainframe.




       (Picture of GPI mainframe in the vertical workstation configuration.)

            GPI mainframe in the vertical workstation configuration.




     (Picture of Zygo's 100,000 square foot headquarters in Middlefield, CT.)

          Zygo's 100,000 square foot headquarters in Middlefield, CT.

<PAGE>

===============================================================================

    No person has been authorized in connection with the offering made hereby to
give any information or make any representation not contained in this Prospectus
in connection with the offer made by this Prospectus and, if given or made, such
information or representation must not be relied upon as having been authorized
by the Company, the Selling Stockholders or the Underwriters. This Prospectus
does not constitute an offer to sell or a solicitation of any offer to buy any
of the securities offered hereby to any person or by anyone in any jurisdiction
in which it is unlawful to make such offer or solicitation. Neither the delivery
of this Prospectus nor any sale made hereunder shall under any circumstances,
create any implication that the information herein is correct as of any time
subsequent to the date hereof.

                    -----------------

                    TABLE OF CONTENTS

                                                  Page
                                                  ----
Prospectus Summary ..............................   3
Risk Factors ....................................   5
Use of Proceeds .................................   8
Price Range of Common Stock .....................   8
Dividend Policy .................................   8
Capitalization ..................................   9
Selected Consolidated Financial Data ............  10
Management's Discussion and Analysis of
  Results of Operations and Financial
  Condition .....................................  11
Business ........................................  17
Management ......................................  29
Principal and Selling Stockholders ..............  31
Underwriting ....................................  33
Legal Matters ...................................  34
Experts .........................................  34
Available Information ...........................  34
Incorporation of Certain Information
  by Reference ..................................  34
Index to Consolidated Financial Statements ...... F-1


                   1,600,000 SHARES

                        [LOGO]

                     COMMON STOCK


                       --------

                      PROSPECTUS

                       --------


                  ALEX. BROWN & SONS
                     INCORPORATED

                NEEDHAM & COMPANY, INC.

                    UNTERBERG HARRIS



                            , 1995
==============================================================================
 
<PAGE>


                                     PART II

Item 14. Other Expenses of Issuance and Distribution.

     The following table sets forth the Company's estimates (other than the
Securities and Exchange Commission registration fee, the NASD filing fee and
the Nasdaq National Market additional listing fee) of the expenses to be
incurred in connection with the issuance and distribution of the shares of
Common Stock being registered, other than underwriting discounts and
commissions:

     Securities and Exchange Commission registration fee ......  $ 19,749
     NASD filing fee ..........................................     6,227
     Nasdaq National Market additional listing fee ............    16,900
     Printing and engraving expenses ..........................   125,000*
     Legal fees and expenses ..................................   185,000*
     Accounting fees and expenses .............................    25,000*
     Blue sky fees and expenses ...............................     3,000*
     Transfer agent and registrar fees ........................     2,500*
     Miscellaneous expenses ...................................    41,624*
                                                                 -------- 
          Total ...............................................  $425,000*
                                                                 ======== 
     -----------
     * estimated

Item 15. Indemnification of Directors and Officers.

     Section 145(a) of the General Corporation Law of the State of Delaware
provides that a Delaware corporation may indemnify any person who was or is a
party or is threatened to be made a party to any threatened, pending or
completed action, suit or proceeding, whether civil, criminal, administrative or
investigative (other than an action by or in the right of the corporation), by
reason of the fact that he is or was a director, officer, employee or agent of
the corporation or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation or enterprise,
against expenses, judgments, fines and amounts paid in settlement actually and
reasonably incurred by him in connection with such action, suit or proceeding if
he acted in good faith and in a manner he reasonably believed to be in or not
opposed to the best interests of the corporation, and, with respect to any
criminal action or proceeding, had no cause to believe his conduct was unlawful.

     Section 145(b) provides that a Delaware corporation may indemnify any
person who was or is a party or is threatened to be made a party to any
threatened, pending or completed action or suit by or in the right of the
corporation to procure a judgment in its favor by reason of the fact that such
person acted in any of the capacities set forth above, against expenses actually
and reasonably incurred by him in connection with the defense or settlement of
such action or suit if he acted under similar standards, except that no
indemnification may be made in respect of any claim, issue or matter as to which
such person shall have been adjudged to be liable to the corporation unless and
only to the extent that the court in which such action or suit was brought shall
determine that despite the adjudication of liability, such person is fairly and
reasonably entitled to be indemnified for such expenses which the court shall
deem proper.

     Section 145 further provides that to the extent a director or officer of a
corporation has been successful in the defense of any action, suit or proceeding
referred to in subsections (a) and (b) or in the defense of any claim, issue or
matter therein, he shall be indemnified against expenses actually and reasonably
incurred by him in connection therewith; that indemnification provided for by
Section 145 shall not be deemed exclusive of any other rights to which the
indemnified party may be entitled; and that the corporation may purchase and
maintain insurance on behalf of a director or officer of the corporation against
any liability asserted against him or incurred by him in any such capacity or
arising out of his status as such whether or not the corporation would have the
power to indemnify him against such liabilities under such Section 145.

     The Company's Certificate of Incorporation and By-laws provide that the
Company shall indemnify certain persons, including officers, directors,
employees and agents, to the fullest extent permitted by Section 145 of the
General Corporation Law of the State of Delaware. The Company has also entered
into indemnification agreements with its current directors and executive
officers. Reference is made to the Certificate of Incorporation, By-laws and

                                      II-1
<PAGE>

Form of Indemnification Agreement filed as Exhibits 3.1, 3.2 and 10.31,
respectively. The Company's directors and officers are insured against losses
arising from any claim against them as such for wrongful acts or omissions,
subject to certain limitations.

     Under Section 8 of the Underwriting Agreement, the Underwriters are
obligated, under certain circumstances, to indemnify officers, directors and
controlling persons of the Company against certain liabilities, including
liabilities under the Securities Act. Reference is made to the form of
Underwriting Agreement filed as Exhibit 1.1 hereto.

     The Company maintains a policy of insurance under which the directors and
officers of the Company are insured, subject to the limits of the policy,
against certain losses arising from claims made against such directors and
officers by reason of any acts or omissions covered under such policy in their
respective capacities as directors and officers.

Item 16.  Exhibits.

 (a)  Exhibits.
   
 1.1     Form of Underwriting Agreement
    
 3.1  Restated Certificate of Incorporation of the Company and amendments
      thereto (Exhibit 3.(i) to the Company's Annual Report on Form 10-K for its
      year ended June 30, 1993)*

 3.2  By-laws of the Company (Exhibit (3)(b) to Registration Statement No.
      2-87253 on Form S-1 hereinafter "Registration No. 2-87253 ")*

 4.1  Shareholders Agreement dated October 17, 1983, between Canon Inc.,
      Wesleyan University, Paul F. Forman, Carl A. Zanoni, and Sol F. Laufer
      (Exhibit (4)(a) to Registration No. 2-87253)*

 4.2  Lease Agreement dated October 1, 1977, between the Connecticut Development
      Authority and the Company (Exhibit (4)(b) to Registration No. 2-87253)*

 4.3  First Amendatory Lease Agreement to Lease Agreement dated October 1, 1977,
      dated May 1, 1981, between the Connecticut Development Authority and the
      Company (Exhibit (4)(c) to Registration No. 2-87253)*

 4.4  Amendment dated October 11, 1983, between The Connecticut Bank and Trust
      Company and the Connecticut Development Authority relating to certain of
      the Company's financial covenants (Exhibit (4)(e) to Registration No.
      2-87253)*
   
 5.1  Opinion of Fulbright & Jaworski L.L.P. with respect to the legality of the
      securities being registered
    
10.1  Confidentiality and Non-Competition Agreement dated October 25, 1983,
      between the Company and Carl A. Zanoni (Exhibit (10)(b) to Registration
      No. 2-87253)*

10.2  Indenture of Mortgage and Trust dated October 1, 1977, between the
      Connecticut Development Authority and The Connecticut Bank and Trust
      Company (Exhibit (10)(h) to Registration No. 2-87253)*

10.3  First Supplemental Indenture to Indenture of Mortgage and Trust, dated as
      of October 1, 1977, relating to Industrial Development Bonds (Zygo
      Project--1977 Series) dated May 1, 1981, between the Connecticut
      Development Authority and The Connecticut Bank and Trust Company (Exhibit
      (10)(1) to Registration No. 2-87253)*

10.4  Guaranty Agreement dated October 1, 1977, between the Company and The
      Connecticut Bank and Trust Company (Exhibit 10)(i) to Registration No.
      2-87253)*

10.5  Bond Purchase Agreement dated October 1, 1977, among the Connecticut
      Development Authority, the Company and The Connecticut Bank and Trust
      Company (Exhibit (10)(j) to Registration No. 2-87253)*

10.6  Representation and Indemnity Agreement dated May 1, 1981, between the
      Connecticut Development Authority, the Company and The Connecticut Bank
      and Trust Company (Exhibit (10)(k) to Registration No. 2-87253)*

                                      II-2

<PAGE>

10.7  Agreement dated May 27, 1975, between the Company and Canon U.S.A., Inc.,
      regarding information sharing and marketing (Exhibit (10)(x) to
      Registration No. 2-87253)*

10.8  Agreement dated November 20, 1980, between the Company and Canon Inc.
      regarding exchange of information (Exhibit (10)(y) to Registration No.
      2-87253)*

10.9  Right of First Refusal agreement between Forman, Zanoni and Laufer and the
      Company (Exhibit 10.40 to the Company's Annual Report on Form 10-K for its
      year ended June 30, 1987)*

10.10 Zygo Corporation Profit Sharing Plan, as amended effective June 30, 1985
      (Exhibit 10.35 to the Company's Annual Report on Form 10-K for its year
      ended June 30, 1985)*

10.11 First Amendment to the Zygo Corporation Profit Sharing Plan (Exhibit 10.28
      to the Company's Annual Report on Form 10-K for its year ended June 30,
      1989)*

10.12 Second Amendment to the Zygo Corporation Profit Sharing Plan (Exhibit
      10.29 to the Company's Annual Report on Form 10-K for its year ended June
      30, 1989)*

10.13 Third Amendment to the Zygo Corporation Profit Sharing Plan (Exhibit 10.30
      to the Company's Annual Report on Form 10-K for its year ended June 30,
      1989)*

10.14 Fourth Amendment to the Zygo Corporation Profit Sharing Plan (Exhibit
      10.31 to the Company's Annual Report on Form 10-K for its year ended June
      30, 1989)*

10.15 Amended and Restated Zygo Corporation Profit Sharing Plan*

10.16 Canon/Zygo Confidentiality Agreement dated March 7, 1990, between the
      Company and Canon Inc. regarding confidential technical information
      received from each other (Exhibit 10.42 to the Company's Annual Report on
      Form 10-K for its year ended June 30, 1991)*

10.17 Employment Agreement dated February 13, 1992, relating to the employment
      of Gary K. Willis by the Company (Exhibit 10.38 to the Company's Annual
      Report on Form 10-K for its year ended June 30, 1992)*

10.18 Amendment, dated August 26, 1993, to the Employment Agreement dated
      February 13, 1992, between Gary K. Willis and the Company (Exhibit 10.22
      to the Company's Annual Report on Form 10-K for its year ended June 30,
      1993)*

10.19 Second Amendment, dated March 10, 1995, to the Employment Agreement dated
      February 13, 1992, between Gary K. Willis and the Company*

10.20 Stock Purchase Agreement dated March 4, 1992, relating to the purchase of
      Company Common Stock by Gary K. Willis from Wesleyan University (Exhibit
      10.39 to the Company's Annual Report on Form 10-K for its year ended June
      30, 1992)*

10.21 Services Agreement dated August 26, 1993, between the Company and Paul F.
      Forman (Exhibit 10.26 to the Company's Annual Report on Form 10-K for its
      year ended June 30, 1993)*

10.22 Non-Competition Agreement dated August 26, 1993, between the Company and
      Paul F. Forman (Exhibit 10.27 to the Company's Annual Report on Form 10-K
      for its year ended June 30, 1993)*

10.23 Services Agreement dated August 26, 1993, between the Company and Sol F.
      Laufer (Exhibit 10.28 to the Company's Annual Report on Form 10-K for its
      year ended June 30, 1993)*

10.24 Non-Competition Agreement dated August 26, 1993, between the Company and
      Sol F. Laufer (Exhibit 10.29 to the Company's Annual Report on Form 10-K
      for its year ended June 30, 1993)*

10.25 Zygo Corporation Amended and Restated Non-Qualified Stock Option Plan
      ratified and approved by the Company's Stockholders on November 19, 1992
      (Exhibit 10.30 to the Company's Annual Report on Form 10-K for its year
      ended June 30, 1993)*

10.26 Employment Agreement dated March 1, 1993, between Mark J. Bonney and the
      Company (Exhibit 10.31 to the Company's Annual Report on Form 10-K for its
      year ended June 30, 1993)*

                                      II-3

<PAGE>

10.27 Termination Agreement dated November 30, 1993, covering the termination of
      the Shareholders' Agreement between Canon Inc., Wesleyan University, Paul
      F. Forman, Carl A. Zanoni, and Sol F. Laufer dated October 17, 1983
      (Exhibit 10.33 to the Company's Annual Report on Form 10-K for its year
      ended June 30, 1994)*

10.28 Registration Rights Agreement dated November 30, 1993, between Canon Inc.,
      Wesleyan University, Paul F. Forman, Carl A. Zanoni, Sol F. Laufer, and
      the Company (Exhibit 10.34 to the Company's Annual Report on Form 10-K for
      its year ended June 30, 1994)*

10.29 Renewal of Line of Credit dated December 1, 1994, between the Company and
      Shawmut Bank Connecticut, N.A.*

10.30 Zygo Corporation Non-Employee Director Stock Option Plan ratified and
      approved by the Company's stockholders on November 17, 1994*
   
10.31 Form of Indemnification Agreement**
    
23.1  Consent of KPMG Peat Marwick LLP
   
23.2  Consent of Fulbright & Jaworski L.L.P. (to be included in Exhibit 5.1 to
      this Registration Statement)
    
24.1  Power of Attorney (included on page II-5)**

- ------------
   
 *  Incorporated herein by reference.
**  Previously filed.
    
Item 17. Undertakings

     The undersigned registrant hereby undertakes that:

          (1) For purposes of determining any liability under the Securities Act
     of 1933, each filing of the registrant's annual report pursuant to section
     13(a) or section 15(d) of the Securities Exchange Act of 1934 that is
     incorporated by reference in the registration statement shall be deemed to
     be a new registration statement relating to the securities offered therein,
     and the offering of such securities at that time shall be deemed to be the
     initial bona fide offering thereof.

          (2) For purposes of determining any liability under the Securities Act
     of 1933, the information omitted from the form of prospectus filed as part
     of this registration statement in reliance upon Rule 430A and contained in
     a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     registration statement as of the time it was declared effective.

          (3) For the purpose of determining any liability under the Securities
     Act of 1933, each post-effective amendment that contains a form of
     prospectus shall be deemed to be a new registration statement relating to
     the securities offered therein, and the offering of such securities at that
     time shall be deemed to be the initial bona fide offering thereof.

     Insofar as indemnification for liabilities arising under the Securities Act
of 1933 may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions, or otherwise, the registrant
has been advised that in the opinion of the Securities and Exchange Commission
such indemnification is against public policy as expressed in the Act and is,
therefore, unenforceable. In the event that a claim for indemnification against
such liabilities (other than the payment by the registrant of expenses incurred
or paid by a director, officer or controlling person of the registrant in the
successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question of whether such indemnification by it is against
public policy as expressed in the Act and will be governed by the final
adjudication of such issue.

                                      II-4

<PAGE>


                                   SIGNATURES
   
     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Amendment No. 1 to
the registration statement to be signed on its behalf by the undersigned
hereunto duly authorized, in the City of Middlefield, State of Connecticut on
the 7th day of December 1995.
    
                                 ZYGO CORPORATION


                                 By          /s/ GARY K. WILLIS
                                    -------------------------------------------
                                                 Gary K. Willis
                                 President, Chief Executive Officer and Director

   
    

<TABLE>
<CAPTION>


                Signature                             Title                             Date
                ---------                             -----                             ----
<S>                                     <C>                                       <C>
   
                   *                    President, Chief Executive                December 7, 1995
- -----------------------------------       Officer and Director (Principal
            Gary K. Willis                Executive Officer) 
                                                         

        /s/ MARK J. BONNEY              Vice President, Finance and               December 7, 1995
- -----------------------------------       Administration, Treasurer, Chief
            Mark J. Bonney                Financial and Accounting Officer
                                          (Principal Financial and Accounting
                                          Officer)

                   *                    Chairman of the Board                     December 7, 1995
- -----------------------------------    
            Paul F. Forman


                   *                    Director                                  December 7, 1995
- -----------------------------------    
            Michael R. Corboy


                   *                    Director                                  December 7, 1995
- -----------------------------------    
            Seymour E. Liebman


                   *                    Director                                  December 7, 1995
- -----------------------------------    
            Robert G. McKelvey


                   *                    Director                                  December 7, 1995
- -----------------------------------    
            Paul W. Murrill


                   *                    Director                                  December 7, 1995
- -----------------------------------    
            Robert B. Taylor


                   *                    Director                                  December 7, 1995
- -----------------------------------    
            Carl A. Zanoni



*By       /s/ MARK J. BONNEY                                                      December 7, 1995
    -------------------------------
              Mark J. Bonney
             Attorney-In-Fact
    
</TABLE>


                                      II-5

<PAGE>


                               EXHIBIT INDEX

Exhibit                           Description                               Page
- -------                           -----------                               ----
   
 1.1  Form of Underwriting Agreement
    
 3.1  Restated Certificate of Incorporation of the Company and amendments
      thereto (Exhibit 3.(i) to the Company's Annual Report on Form 10-K
      for its year ended June 30, 1993)*

 3.2  By-laws of the Company (Exhibit (3)(b) to Registration Statement No.
      2-87253 on Form S-1 hereinafter "Registration No. 2-87253")*

 4.1  Shareholders Agreement dated October 17, 1983, between Canon Inc.,
      Wesleyan University, Paul F. Forman, Carl A. Zanoni, and Sol F.
      Laufer (Exhibit (4)(a) to Registration No. 2-87253)*

 4.2  Lease Agreement dated October 1, 1977, between the Connecticut
      Development Authority and the Company (Exhibit (4)(b) to Registration
      No. 2-87253)*

 4.3  First Amendatory Lease Agreement to Lease Agreement dated October 1,
      1977, dated May 1, 1981, between the Connecticut Development
      Authority and the Company (Exhibit (4)(c) to Registration No.
      2-87253)*

 4.4  Amendment dated October 11, 1983, between The Connecticut Bank and
      Trust Company and the Connecticut Development Authority relating to
      certain of the Company's financial covenants (Exhibit (4)(e) to
      Registration No. 2-87253)*
   
 5.1  Opinion of Fulbright & Jaworski L.L.P. with respect to the legality
      of the securities being registered
    
10.1  Confidentiality and Non-Competition Agreement dated October 25, 1983,
      between the Company and Carl A. Zanoni (Exhibit (10)(b) to
      Registration No. 2-87253)*

10.2  Indenture of Mortgage and Trust dated October 1, 1977, between the
      Connecticut Development Authority and The Connecticut Bank and Trust
      Company (Exhibit (10)(h) to Registration No. 2-87253)*

10.3  First Supplemental Indenture to Indenture of Mortgage and Trust,
      dated as of October 1, 1977, relating to Industrial Development Bonds
      (Zygo Project--1977 Series) dated May 1, 1981, between the
      Connecticut Development Authority and The Connecticut Bank and Trust
      Company (Exhibit (10)(1) to Registration No. 2-87253)*

10.4  Guaranty Agreement dated October 1, 1977, between the Company and The
      Connecticut Bank and Trust Company (Exhibit 10)(i) to Registration
      No. 2-87253)*

10.5  Bond Purchase Agreement dated October 1, 1977, among the Connecticut
      Development Authority, the Company and The Connecticut Bank and Trust
      Company (Exhibit (10)(j) to Registration No. 2-87253)*

10.6  Representation and Indemnity Agreement dated May 1, 1981, between the
      Connecticut Development Authority, the Company and The Connecticut
      Bank and Trust Company (Exhibit (10)(k) to Registration No. 2-87253)*

10.7  Agreement dated May 27, 1975, between the Company and Canon U.S.A.,
      Inc., regarding information sharing and marketing (Exhibit (10)(x) to
      Registration No. 2-87253)*

10.8  Agreement dated November 20, 1980, between the Company and Canon Inc.
      regarding exchange of information (Exhibit (10)(y) to Registration
      No. 2-87253)*

10.9  Right of First Refusal agreement between Forman, Zanoni and Laufer
      and the Company (Exhibit 10.40 to the Company's Annual Report on Form
      10-K for its year ended June 30, 1987)*

10.10 Zygo Corporation Profit Sharing Plan, as amended effective June 30,
      1985 (Exhibit 10.35 to the Company's Annual Report on Form 10-K for
      its year ended June 30, 1985)*

10.11 First Amendment to the Zygo Corporation Profit Sharing Plan (Exhibit
      10.28 to the Company's Annual Report on Form 10-K for its year ended
      June 30, 1989)*


<PAGE>

Exhibit                           Description                               Page
- -------                           -----------                               ----

10.12 Second Amendment to the Zygo Corporation Profit Sharing Plan (Exhibit
      10.29 to the Company's Annual Report on Form 10-K for its year ended
      June 30, 1989)*

10.13 Third Amendment to the Zygo Corporation Profit Sharing Plan (Exhibit
      10.30 to the Company's Annual Report on Form 10-K for its year ended
      June 30, 1989)*

10.14 Fourth Amendment to the Zygo Corporation Profit Sharing Plan (Exhibit
      10.31 to the Company's Annual Report on Form 10-K for its year ended
      June 30, 1989)*

10.15 Amended and Restated Zygo Corporation Profit Sharing Plan*

10.16 Canon/Zygo Confidentiality Agreement dated March 7, 1990, between the
      Company and Canon Inc. regarding confidential technical information
      received from each other (Exhibit 10.42 to the Company's Annual
      Report on Form 10-K for its year ended June 30, 1991)*

10.17 Employment Agreement dated February 13, 1992, relating to the
      employment of Gary K. Willis by the Company (Exhibit 10.38 to the
      Company's Annual Report on Form 10-K for its year ended June 30,
      1992)*

10.18 Amendment, dated August 26, 1993, to the Employment Agreement dated
      February 13, 1992, between Gary K. Willis and the Company (Exhibit
      10.22 to the Company's Annual Report on Form 10-K for its year ended
      June 30, 1993)*

10.19 Second Amendment, dated March 10, 1995, to the Employment Agreement
      dated February 13, 1992, between Gary K. Willis and the Company*

10.20 Stock Purchase Agreement dated March 4, 1992, relating to the
      purchase of Company Common Stock by Gary K. Willis from Wesleyan
      University (Exhibit 10.39 to the Company's Annual Report on Form 10-K
      for its year ended June 30, 1992)*

10.21 Services Agreement dated August 26, 1993, between the Company and
      Paul F. Forman (Exhibit 10.26 to the Company's Annual Report on Form
      10-K for its year ended June 30, 1993)*

10.22 Non-Competition Agreement dated August 26, 1993, between the Company
      and Paul F. Forman (Exhibit 10.27 to the Company's Annual Report on
      Form 10-K for its year ended June 30, 1993)*

10.23 Services Agreement dated August 26, 1993, between the Company and Sol
      F. Laufer (Exhibit 10.28 to the Company's Annual Report on Form 10-K
      for its year ended June 30, 1993)*

10.24 Non-Competition Agreement dated August 26, 1993, between the Company
      and Sol F. Laufer (Exhibit 10.29 to the Company's Annual Report on
      Form 10-K for its year ended June 30, 1993)*

10.25 Zygo Corporation Amended and Restated Non-Qualified Stock Option Plan
      ratified and approved by the Company's Stockholders on November 19,
      1992 (Exhibit 10.30 to the Company's Annual Report on Form 10-K for
      its year ended June 30, 1993)*

10.26 Employment Agreement dated March 1, 1993, between Mark J. Bonney and
      the Company (Exhibit 10.31 to the Company's Annual Report on Form
      10-K for its year ended June 30, 1993)*

10.27 Termination Agreement dated November 30, 1993, covering the
      termination of the Shareholders' Agreement between Canon Inc.,
      Wesleyan University, Paul F. Forman, Carl A. Zanoni, and Sol F.
      Laufer dated October 17, 1983 (Exhibit 10.33 to the Company's Annual
      Report on Form 10-K for its year ended June 30, 1994)*

10.28 Registration Rights Agreement dated November 30, 1993, between Canon
      Inc., Wesleyan University, Paul F. Forman, Carl A. Zanoni, Sol F.
      Laufer, and the Company (Exhibit 10.34 to the Company's Annual Report
      on Form 10-K for its year ended June 30, 1994)*

10.29 Renewal of Line of Credit dated December 1, 1994, between the Company
      and Shawmut Bank Connecticut, N.A.*


<PAGE>

Exhibit                           Description                               Page
- -------                           -----------                               ----

10.30 Zygo Corporation Non-Employee Director Stock Option Plan ratified and
      approved by the Company's stockholders on November 17, 1994*
   
10.31 Form of Indemnification Agreement**
    
23.1  Consent of KPMG Peat Marwick LLP
   
23.2  Consent of Fulbright & Jaworski L.L.P. (to be included in Exhibit 5.1 to
      this Registration Statement)

24.1  Power of Attorney (included on page II-5)**
    
- ------------
 *  Incorporated herein by reference.
   
**  Previously filed.
    



                                                                     EXHIBIT 1.1

                                1,600,000 Shares

                                ZYGO CORPORATION

                                  Common Stock

                                ($.10 Par Value)

                             UNDERWRITING AGREEMENT

                                                               December __, 1995

ALEX. BROWN & SONS INCORPORATED
NEEDHAM & COMPANY, INC.
UNTERBERG HARRIS
As Representatives of the
  Several Underwriters
c/o Alex. Brown & Sons Incorporated
135 East Baltimore Street
Baltimore, Maryland 21202

Gentlemen:

     Zygo Corporation, a Delaware corporation (the "Company"), and certain
stockholders of the Company named in Schedule II hereto (the "Selling
Stockholders") propose to sell to the several underwriters (the "Underwriters")
named in Schedule I hereto for whom you are acting as representatives (the
"Representatives") an aggregate of 1,600,000 shares of the Company's Common
Stock, $.10 par value (the "Firm Shares") of which 845,000 shares will be sold
by the Company and 755,000 shares will be sold by the Selling Stockholders. The
respective amounts of the Firm Shares to be so purchased by the several
Underwriters are set forth opposite their names in Schedule I hereto, and the
respective amounts to be sold by the Selling Stockholders are set forth opposite
their names in Schedule II hereto. The Company and the Selling Stockholders are
sometimes referred to herein collectively as the "Sellers". The Company also
proposes to sell at the Underwriters' option an aggregate of up to 240,000
additional shares of the Company's Common Stock (the "Option Shares") as set
forth below.

     As the Representatives, you have advised the Company and the Selling
Stockholders (a) that you are authorized to enter into this Agreement on behalf
of the several Underwriters, and (b) that the several Underwriters are willing,
acting severally and not jointly, to purchase the 

                                      -1-

<PAGE>

numbers of Firm Shares set forth opposite their respective names in Schedule I,
plus their pro rata portion of the Option Shares if you elect to exercise the
over-allotment option in whole or in part for the accounts of the several
Underwriters. The Firm Shares and the Option Shares (to the extent the
aforementioned option is exercised) are herein collectively called the "Shares".

     In consideration of the mutual agreements contained herein and of the
interests of the parties in the transactions contemplated hereby, the parties
hereto agree as follows:

     1. Representations and Warranties of the Company and the Selling
Stockholders.

     (a) The Company represents and warrants as follows:

          (i) A registration statement on Form S-3 (File No. 33-63775) with
     respect to the Shares has been carefully prepared by the Company in
     conformity with the requirements of the Securities Act of 1933, as amended
     (the "Act"), and the rules and regulations (the "Rules and Regulations") of
     the Securities and Exchange Commission (the "Commission") promulgated
     thereunder and has been filed with the Commission under the Act. The
     Company has complied with the conditions for the use of Form S-3. Copies of
     such registration statement, including any amendments thereto, the
     preliminary prospectuses (meeting the requirements of Rule 430A of the
     Rules and Regulations) contained therein and the exhibits, financial
     statements and schedules, as finally amended and revised, have heretofore
     been delivered by the Company to you. Such registration statement, herein
     referred to as the "Registration Statement", which shall be deemed to
     include all information omitted therefrom in reliance upon Rule 430A and
     contained in the Prospectus referred to below, has been declared effective
     by the Commission under the Act and no post-effective amendment to the
     Registration Statement has been filed as of the date of this Agreement. The
     term "Prospectus" means the form of prospectus first filed by the Company
     with the Commission pursuant to its Rule 424(b) and Rule 430A or, if the
     Company relies on Rule 434 of the Rules and Regulations, the "Term Sheet"
     relating to the Shares together with the preliminary prospectus that such
     Term Sheet supplements. "Term Sheet" means any term sheet that satisfies
     the requirements of Rule 434. Each preliminary prospectus included in the
     Registration Statement prior to the time it becomes effective is herein
     referred to as a "Preliminary Prospectus". Any reference herein to any
     Preliminary Prospectus or the Prospectus shall be deemed to refer to and
     include the documents incorporated by reference therein, as of the date of
     such Preliminary Prospectus or Prospectus, as the case may be, and, in the
     case of any reference herein to any Prospectus, also shall be deemed to
     include any documents incorporated by reference therein, and any
     supplements or amendments thereto, filed with the Commission after the date
     of filing of the Prospectus under Rules 424(b) and 430A, and prior to the
     termination of the offering of the Shares by the Underwriters.

          (ii) The Company has been duly organized and is validly existing as a
     corporation in good standing under the laws of the State of Delaware, with
     corporate power and authority to own its properties and conduct its
     business as described in the Registration Statement; Zygo International
     Corporation and Zygo Credit Corporation, each a Delaware

                                      -2-

<PAGE>

     corporation, (the "Subsidiaries"), have been duly organized and are validly
     existing as corporations in good standing under the laws of the State of
     Delaware, with corporate power and authority to own or lease their
     respective properties and conduct their business as presently conducted;
     the Company and the Subsidiaries are duly qualified to transact business in
     all jurisdictions in which the conduct of their business requires such
     qualification, except where the failure to be so qualified does not have a
     material adverse effect on the Company and the Subsidiaries taken as a
     whole; other than the Subsidiaries, the Company has no material
     subsidiaries; the outstanding shares of capital stock of the Subsidiary
     have been duly authorized and validly issued, are fully paid and
     non-assessable and are owned by the Company free and clear of all liens,
     encumbrances and security interests; and no options, warrants or other
     rights to purchase, agreements or other obligations to issue or other
     rights to convert any obligations into shares of capital stock or ownership
     interests in the Subsidiary are outstanding.

          (iii) The outstanding shares of Common Stock of the Company, including
     all shares to be sold by the Selling Stockholders, have been duly
     authorized and validly issued and are fully paid and non-assessable; the
     portion of the Shares to be issued and sold by the Company have been duly
     authorized and when issued and paid for as contemplated herein will be
     validly issued, fully-paid and non-assessable; and no preemptive rights of
     Stockholders exist under Delaware law or in the Company's Certificate of
     Incorporation or Bylaws or in any other agreement to which the Company is a
     party or of which the Company is aware with respect to any of the Shares or
     the issue and sale thereof. Neither the filing of the Registration
     Statement nor the offering or sale of the Shares contemplated by this
     Agreement gives rise to any rights, other than those which have been waived
     or satisfied, for or relating to the registration of any shares of Common
     Stock.

          (iv) The Shares conform with the statements concerning them in the
     Registration Statement. The certificates, if any, representing the Shares
     are genuine, and the Company has no knowledge of any fact that would impair
     the validity thereof.

          (v) The Commission has not issued an order preventing or suspending
     the use of any Preliminary Prospectus relating to the proposed offering of
     the Shares nor instituted proceedings for that purpose and each Preliminary
     Prospectus, at the time of filing thereof, did not contain any untrue
     statement of material fact or omit to state any material fact required to
     be stated therein or necessary to make the statements therein, in light of
     the circumstances in which they were made, not misleading. The Registration
     Statement contains and the Prospectus and any amendments or supplements
     thereto will contain all statements which are required to be stated therein
     by, and in all respects conform or will conform, as the case may be, to the
     requirements of, the Act and the Rules and Regulations. The documents
     incorporated by reference in the Prospectus, at the time filed with the
     Commission or as subsequently amended in a filing with the Commission,
     conformed or will conform in all respects to the requirements of the
     Securities Exchange Act of 1934, as amended (the "Exchange Act"), or the
     Act, as applicable, and the Rules and Regulations of the Commission
     thereunder. Neither the Registration Statement nor any amendment thereto,
     and neither the Prospectus nor any supplement thereto, contains or will
     contain, as the case may be, any untrue statement of a

                                      -3-

<PAGE>

     material fact or omits or will omit to state any material fact required to
     be stated therein or necessary to make the statements therein, in the light
     of the circumstances under which they were made, not misleading; provided,
     however, that the Company makes no representations or warranties as to
     information contained in or omitted from the Registration Statement or the
     Prospectus, or any such amendment or supplement, in reliance upon, and in
     conformity with, written information furnished to the Company by or on
     behalf of any Underwriter through the Representatives, specifically for use
     in the preparation thereof.

          (vi) The consolidated financial statements of the Company and one of
     the Subsidiaries, together with related notes and schedules as set forth or
     incorporated by reference in the Registration Statement, present fairly the
     financial position and the results of operations of the Company and such
     Subsidiary consolidated, at the indicated dates and for the indicated
     periods. Such financial statements have been prepared in accordance with
     generally accepted accounting principles consistently applied throughout
     the periods involved, and all adjustments necessary for a fair presentation
     of results for such periods have been made. The selected and summary
     financial and statistical data included or incorporated by reference in the
     Registration Statement presents fairly the information shown therein and
     have been compiled on a basis consistent with the financial statements
     presented therein.

          (vii) There is no action, suit, claim or proceeding pending or, to the
     knowledge of the Company, threatened against the Company or the
     Subsidiaries before any court or administrative agency or otherwise which
     might result in any material adverse change in the business, properties,
     assets, rights, operations or condition (financial or otherwise) or
     prospects of the Company and of the Subsidiaries taken as a whole or to
     prevent the consummation of the transactions contemplated hereby, except as
     set forth in the Registration Statement.

          (viii) The Company and the Subsidiaries have good and marketable title
     to all of the properties and assets reflected in the financial statements
     hereinabove described (or as described in the Registration Statement),
     subject to no lien, mortgage, pledge, charge or encumbrance of any kind
     except those reflected in such financial statements (or as described in the
     Registration Statement) or which are not material in amount. The Company
     and the Subsidiaries occupy their leased properties under valid and binding
     leases conforming, to the extent described in the Registration Statement,
     in all material respects to such description.

          (ix) The Company and the Subsidiaries have filed all Federal, State
     and foreign income tax returns which have been required to be filed and
     have paid all taxes indicated by said returns and all assessments received
     by them or any of them to the extent that such taxes have become due and
     are not being contested in good faith. All federal and state tax
     liabilities are adequately provided for on the books of the Company and
     properly reflected in the Company's financial statements.

          (x) Since the respective dates as of which information is given in the
     Registration Statement, as it may be amended or supplemented, there has not
     been any material adverse change or any development involving a prospective
     material adverse change in or

                                      -4-

<PAGE>

     affecting the condition, financial or otherwise, of the Company and the
     Subsidiaries taken as a whole or the earnings, business affairs,
     management, properties, assets, rights, operations, condition (financial or
     otherwise), or business prospects of the Company and its Subsidiaries taken
     as a whole, whether or not occurring in the ordinary course of business,
     and there has not been any material transaction entered into by the Company
     or the Subsidiaries, other than transactions in the ordinary course of
     business and changes and transactions contemplated by the Registration
     Statement, as it may be amended or supplemented. The Company and the
     Subsidiaries have no material contingent obligations which are not
     disclosed in the Registration Statement, as it may be amended or
     supplemented.

          (xi) Neither the Company nor any Subsidiary is, or with the giving of
     notice, lapse of time or both, will be, in violation of or in default under
     its Certificate of Incorporation or Bylaws or under any agreement, lease,
     contract, indenture or other instrument or obligation to which it is a
     party or by which it or any of its properties is bound and which default is
     of material significance in respect of the business or financial condition
     of the Company and the Subsidiaries taken as a whole. The consummation of
     the transactions herein contemplated and the fulfillment of the terms
     hereof will not conflict with or result in a breach of any of the terms or
     provisions of, or constitute a default under, (i) any indenture, mortgage,
     deed of trust or other agreement or instrument to which the Company or any
     Subsidiary is a party and which conflict, breach or default is of material
     significance in respect of the business or financial condition of the
     Company and the Subsidiaries taken as a whole, or (ii) the Certificate of
     Incorporation or Bylaws of the Company or any order, rule or regulation
     applicable to the Company or the Subsidiary of any court or of any
     regulatory body or administrative agency or other governmental body having
     jurisdiction.

          (xii) Each approval, consent, order, authorization, designation,
     declaration or filing by or with any regulatory, administrative or other
     governmental body necessary in connection with the execution and delivery
     by the Company of this Agreement and the consummation of the transactions
     herein contemplated (except such additional steps as may be required by the
     National Association of Securities Dealers, Inc. (the "NASD") or may be
     necessary to qualify the Shares for public offering by the Underwriters
     under State securities or Blue Sky laws) has been obtained or made and is
     in full force and effect.

          (xiii) The Company and the Subsidiaries hold all material licenses,
     certificates and permits from governmental authorities which are necessary
     to the conduct of their businesses, except where the failure to hold such
     item would not have a material adverse effect on the Company; and neither
     the Company nor any of the Subsidiaries has infringed any patents, patent
     rights, trade names, trademarks or copyrights, which infringement is
     material to the businesses of the Company and the Subsidiaries taken as a
     whole.

          (xiv) KPMG Peat Marwick LLP, who have certified certain of the
     financial statements filed with the Commission as part of, or incorporated
     by reference in, the Registration Statement, are independent public
     accountants as required by the Act and the Rules and Regulations.

                                      -5-
<PAGE>

           (xv) The Common Stock of the Company is designated on the NASD
      Automated Quotations National Market ("NASDAQ NMS").

          (xvi) To the Company's knowledge, there are no affiliations or
     associations between any member of the NASD and any of the Company's
     officers, directors, or 5% or greater security holders, except as set forth
     in the Registration Statement or as otherwise disclosed in writing to the
     Representatives.

          (xvii) Neither the Company, nor to the Company's knowledge, any of its
     affiliates, has taken, directly or indirectly, any action designed to cause
     or result in, or which has constituted or which might reasonably be
     designed to constitute, the stabilization or manipulation of the price of
     the shares of Common Stock to facilitate the sale or resale of the Shares.

          (xviii) With respect to each patent issued to or each patent
     application owned by the Company or any of its subsidiaries, as the case
     may be:

               1. to the best knowledge of the Company or such subsidiary, as
          the case may be, all material prior art and other material information
          were accurately disclosed in each patent application;

               2. no knowing misrepresentation of material fact was made, and no
          knowing concealment of any material fact occurred in the prosecution
          of any such patent application;

               3. neither the Company nor any such subsidiary, as the case may
          be, is aware of any information which would compel a court to hold
          that any of the Company's or such subsidiary's issued patents or
          allowed claims are invalid or unenforceable.

          (xix) There are no inter partes proceedings now pending, or, to the
     Company's knowledge, threatened, to which the Company or any of its
     subsidiaries could be a party, before the United States Patent and
     Trademark Office or before comparable governmental bodies in foreign
     countries, which, if determined adversely to the Company's interest, would
     have a material adverse effect on the consolidated financial position,
     shareholders' equity, or results of operations of the Company, or on the
     properties and business prospects of the Company and its subsidiaries taken
     as a whole.

     (b) Each of the Selling Stockholders, severally and not jointly, represents
and warrants as follows:

          (i) Such Selling Stockholder now has and at the Closing Date (as
     hereinafter described) will have good and marketable title to the Firm
     Shares to be sold by such Selling Stockholder, free of any liens,
     encumbrances, equities and claims, and full right, power and authority to
     effect the sale and delivery of such Firm Shares; and upon the delivery of
     and payment for such Firm Shares pursuant

                                      -6-
<PAGE>

     to this Agreement, the Underwriters will acquire good and marketable
     title thereto, free of any liens, encumbrances, equities and claims.

          (ii) Such Selling Stockholder has full right, power and authority to
     execute and deliver this Agreement and the Custody Agreement and Power of
     Attorney referred to in Section 2 below (the "Custody Agreement"), and to
     perform its obligations under such agreements. The consummation by such
     Selling Stockholder of the transactions herein contemplated and the
     fulfillment by such Selling Stockholder of the terms hereof will not result
     in a breach of any of the terms and provisions of, or constitute a default
     under, in the case of corporate Selling Stockholders only, any material
     indenture, mortgage, deed of trust or other agreement or instrument to
     which such Selling Stockholder is a party and which would constitute a
     material impediment on the obligations of the Selling Stockholder hereunder
     and under the Custody Agreement, or, in the case of all Selling
     Stockholders, of any order, rule or regulation applicable to such Selling
     Stockholder of any court or of any regulatory body or administrative agency
     or other governmental body having jurisdiction.

          (iii) Such Selling Stockholder has not taken and will not take,
     directly or indirectly, any action designed to, or which has constituted,
     or which might reasonably be expected to cause or result in stabilization
     or manipulation of the price of the Common Stock of the Company.

          (iv) The Selling Stockholder agrees not to offer, sell, or contract to
     sell, sell short, or otherwise dispose of, directly or indirectly, any
     shares of Common Stock beneficially owned by the Selling Stockholder or any
     securities convertible into, or exchangeable or exercisable for, or
     derivative of, shares of Common Stock for a period of 90 days after the
     date of the Prospectus except with the prior written consent of Alex. Brown
     & Sons Incorporated and, in the case of Mr. Paul F. Forman and Mr. Carl A.
     Zanoni only, except that each such Selling Stockholder may exercise
     employee stock options to purchase up to 3,750 shares of Common Stock and
     may sell any or all such 3,750 shares of Common Stock during such 90 day
     period.

          (v) The Custody Agreement appointing certain individuals as such
     Selling Stockholders' attorney-in-fact to the extent set forth therein has
     been duly executed and delivered by such Selling Stockholder and is the
     valid and binding agreement of such Selling Stockholder.

          (vi) Without having undertaken any independent investigation of the
     accuracy or completeness of either the representations and warranties of
     the Company contained herein or the information contained in the
     Registration Statement and documents incorporated by reference therein,
     such Selling Stockholder has no actual knowledge that the representations
     and warranties of the

                                      -7-
<PAGE>

     Company contained in this Section 1 are not true and correct in all
     material respects; and the sale of the Firm Shares by such Selling
     Stockholder pursuant hereto is not prompted by any information concerning
     the Company or the Subsidiary which is not set forth in the Registration
     Statement or the documents incorporated by reference therein. The
     information pertaining to such Selling Stockholder under the caption
     "Principal and Selling Stockholders" in the Prospectus is complete and
     accurate in all material respects.

     In order to document the Underwriters' compliance with the reporting and
withholding provisions of the Tax Equity and Fiscal Responsibility Act of 1982
and the Interest and Dividend Tax Compliance Act of 1983 with respect to the
transactions herein contemplated, each of the Selling Stockholders agrees to
deliver to you prior to or at the Closing Date a properly completed and executed
United States Treasury Department Form W-9 (or other applicable form or
statement specified by Treasury Department regulations in lieu thereof).

     2. Purchase, Sale and Delivery of the Firm Shares. On the basis of the
representations, warranties and covenants herein contained, and subject to the
conditions herein set forth, the Sellers agree to sell to the Underwriters and
each Underwriter agrees, severally and not jointly, to purchase, at a price of
$_____ per share, the number of Firm Shares set forth opposite the name of each
Underwriter in Schedule I hereof, subject to adjustments in accordance with
Section 9 hereof. The number of Firm Shares to be purchased by each Underwriter
from each Seller shall be as nearly as practicable in the same proportion to the
total number of Firm Shares being sold by each Seller as the number of Firm
Shares being purchased by each Underwriter bears to the total number of Firm
Shares to be sold hereunder. The obligations of the Company and of each of the
Selling Stockholders shall be several and not joint.

     Certificates in negotiable form for the total number of the Shares to be
sold hereunder by the Selling Stockholders have been placed in custody with the
Company as custodian (in such capacity only, the "Custodian") pursuant to the
Custody Agreement executed by each Selling Stockholder for delivery of all Firm
Shares to be sold hereunder by the Selling Stockholders. Each of the Selling
Stockholders specifically agrees that the Firm Shares represented by the
certificates held in custody for the Selling Stockholders under the Custody
Agreement are subject to the interests of the Underwriters hereunder, that the
arrangements made by the Selling Stockholders for such custody are to that
extent irrevocable, and that the obligations of the Selling Stockholders
hereunder shall not be terminable by any act or deed of the Selling Stockholders
(or by any other person, firm or corporation including the Company, the
Custodian or the Underwriters) or by operation of law (including the death of an
individual Selling Stockholder or the dissolution of a corporate Selling
Stockholder) or by the occurrence of any other event or events, except as set
forth in the Custody Agreement. If any such event should occur prior to the
delivery to the Underwriters of the Firm Shares hereunder, certificates for the
Firm Shares shall be delivered by the Custodian in accordance with the terms and
conditions of this Agreement as if such event has not occurred. The Custodian is
authorized to receive and acknowledge receipt of the proceeds of sale of the
Shares held by it against delivery of such Shares.

                                      -8-
<PAGE>

     Payment for the Firm Shares to be sold hereunder is to be made in New York
Clearing House funds by certified or bank cashier's checks drawn to the order of
the Company for the Shares to be sold by it and to the order of "Zygo
Corporation, as Custodian for Zygo Corporation Selling Stockholders" for the
Shares to be sold by the Selling Stockholders, in each case against delivery of
certificates therefor to the Representatives for the several accounts of the
Underwriters. Such payment and delivery are to be made at the offices of Alex.
Brown & Sons Incorporated, 135 East Baltimore Street, Baltimore, Maryland, at
10:00 A.M., Baltimore time, on the third business day after the date of this
Agreement or at such other time and date not later than five business days
thereafter as you and the Company shall agree upon, such time and date being
herein referred to as the "Closing Date." (As used herein, "business day" means
a day on which the New York Stock Exchange is open for trading and on which
banks in New York are open for business and not permitted by law or executive
order to be closed.) The certificates for the Firm Shares will be delivered in
such denominations and in such registrations as the Representatives request in
writing not later than the second full business day prior to the Closing Date,
and will be made available for inspection by the Representatives at least one
business day prior to the Closing Date.

     In addition, on the basis of the representations and warranties herein
contained and subject to the terms and conditions herein set forth, the Company
hereby grants an option to the several Underwriters to purchase the Option
Shares at the price per share as set forth in the first paragraph of this
Section 2. The option granted hereby may be exercised in whole or in part but
only once and at any time upon written notice given within 30 days after the
date of this Agreement, by you, as Representatives of the several Underwriters,
to the Company setting forth the number of Option Shares as to which the several
Underwriters are exercising the option, the names and denominations in which the
Option Shares are to be registered and the time and date at which such
certificates are to be delivered. The time and date at which certificates for
Option Shares are to be delivered shall be determined by the Representatives but
shall not be earlier than three nor later than 10 full business days after the
exercise of such option, nor in any event prior to the Closing Date (such time
and date being herein referred to as the "Option Closing Date"). If the date of
exercise of the option is three or more days before the Closing Date, the notice
of exercise shall set the Closing Date as the Option Closing Date. The number of
Option Shares to be purchased by each Underwriter shall be in the same
proportion to the total number of Option Shares being purchased as the number of
Firm Shares being purchased by such Underwriter bears to the total number of
Firm Shares, adjusted by you in such manner as to avoid fractional shares. The
option with respect to the Option Shares granted hereunder may be exercised only
to cover over-allotments in the sale of the Firm Shares by the Underwriters.
You, as Representatives of the several Underwriters, may cancel such option at
any time prior to its expiration (but in no case after exercise, except as
provided in Section 11 hereof) by giving written notice of such cancellation to
the Company. To the extent, if any, that the option is exercised, payment for
the Option Shares shall be made on the Option Closing Date in New York Clearing
House funds by certified or bank cashier's check drawn to the order of the
Company against delivery of certificates therefor at the offices of Alex. Brown
& Sons Incorporated, 135 East Baltimore Street, Baltimore, Maryland.

                                      -9-
<PAGE>

     3. Offering by the Underwriters. It is understood that the several
Underwriters are to make a public offering of the Firm Shares as soon as the
Representatives deem it advisable to do so. The Firm Shares are to be initially
offered to the public at the initial public offering price set forth in the
Prospectus. The Representatives may from time to time change the public offering
price and other selling terms; provided, however, in no event shall any such
changes alter the purchase price for the Shares to be acquired by the
Underwriters as provided for in Section 2 hereof. To the extent, if at all, that
any Option Shares are purchased pursuant to Section 2 hereof, the Underwriters
will offer them to the public on the foregoing terms.

     It is further understood that you will act as the Representatives for the
Underwriters in the offering and sale of the Shares in accordance with a Master
Agreement Among Underwriters entered into by you and the several other
Underwriters.

     4. Covenants of the Company and the Selling Stockholders

     (a) The Company covenants and agrees with the several Underwriters and the
Selling Stockholders that:

          (i) The Company will (A) use its best efforts to cause the
     Registration Statement to become effective or, if the procedures in Rule
     430A of the Rules and Regulations is followed, to prepare and timely file
     with the Commission under Rule 424(b) of the Rules and Regulations a
     Prospectus in the form approved by the Representatives containing
     information previously omitted at the time of effectiveness of the
     Registration Statement in reliance on Rule 430A of the Rules and
     Regulations, (B) not file any amendment to the Registration Statement or
     supplement to the Prospectus or document incorporated by reference therein
     of which the Representatives shall not previously have been advised and
     furnished with a copy or to which the Representatives shall have reasonably
     objected in writing or which is not in compliance with the Rules and
     Regulations, and (C) file on a timely basis all reports and any definitive
     proxy or information statements required to be filed by the Company with
     the Commission subsequent to the date of the Prospectus and prior to the
     termination of the offering of the Shares by the Underwriters.

          (ii) The Company will advise the Representatives promptly (A) when the
     Registration Statement or any post-effective amendment thereto shall have
     become effective, (B) of receipt of any comments from the Commission, (C)
     of any request of the Commission for amendment of the Registration
     Statement or for supplement to the Prospectus or for any additional
     information, and (D) of the issuance by the Commission of any stop order
     suspending the effectiveness of the Registration Statement or the use of
     the Prospectus or of the institution of any proceedings for that purpose,
     and the Company will use its best efforts to prevent the issuance of any
     such stop order preventing or suspending the use of the Prospectus and to
     obtain as soon as possible the lifting thereof, if issued.

          (iii) The Company will cooperate with the Representatives in
     endeavoring to qualify the Shares for sale under the securities laws of
     such jurisdictions as the Representatives

                                      -10-
<PAGE>

     may reasonably have designated in writing and will make such applications,
     file such documents and furnish such information as may be reasonably
     required for that purpose, provided the Company shall not be required to
     qualify as a foreign corporation or to file a general consent to service of
     process in any jurisdiction where it is not now so qualified or required to
     file such a consent. The Company will, from time to time, prepare and file
     such statements, reports and other documents, as are or may be required to
     continue such qualifications in effect for so long a period as the
     Representatives may reasonably request for distribution of the Shares.

          (iv) The Company will deliver to, or upon the order of, the
     Representatives, from time to time, as many copies of any Preliminary
     Prospectus as the Representatives may reasonably request. The Company will
     deliver to, or upon the order of, the Representatives during the period
     when delivery of a Prospectus is required under the Act, as many copies of
     the Prospectus in final form, or as thereafter amended or supplemented, as
     the Representatives may reasonably request. The Company will deliver to the
     Representatives at or before the Closing Date, two signed copies of the
     Registration Statement and all amendments thereto including all exhibits
     filed therewith, and will deliver to the Representatives such number of
     copies of the Registration Statement (including such number of copies of
     the exhibits filed therewith that may reasonably be requested), including
     documents incorporated by reference therein, but without exhibits, and of
     all amendments thereto, as the Representatives may reasonably request.

          (v) The Company will comply, to the best of its ability, with the Act
     and the Rules and Regulations and the Exchange Act, and the rules and
     regulations of the Commission promulgated thereunder, so as to permit the
     completion of the distribution of the Shares as contemplated in this
     Agreement and the Prospectus. If during the period in which a prospectus is
     required by law to be delivered by an Underwriter or dealer any event shall
     occur as a result of which, in the judgment of the Company or in the
     reasonable opinion of the Underwriters, it becomes necessary to amend or
     supplement the Prospectus in order to make the statements therein, in the
     light of the circumstances existing at the time the Prospectus is delivered
     to a purchaser, not misleading, or, if it is necessary at any time to amend
     or supplement the Prospectus to comply with any law, the Company promptly
     will either (i) prepare and file with the Commission an appropriate
     amendment to the Registration Statement or supplement to the Prospectus, or
     (ii) prepare and file with the Commission an appropriate filing under the
     Exchange Act which shall be incorporated by reference in the Prospectus so
     that the Prospectus as so amended or supplemented will not, in the light of
     the circumstances when it is so delivered, be misleading, or so that the
     Prospectus will comply with law.

          (vi) The Company will make generally available to its security
     holders, as soon as it is practicable to do so, but in any event not later
     than 15 months after the effective date of the Registration Statement, an
     earnings statement (which need not be audited) in reasonable detail,
     covering a period of at least 12 consecutive months beginning after the
     effective date of the Registration Statement, which earning statement shall
     satisfy the requirements of Section 11(a) of the Act and Rule 158 of the
     Rules and Regulations and will advise you in writing when such statement
     has been so made available.

                                      -11-
<PAGE>

          (vii) The Company will, for a period of five years from the Closing
     Date, deliver to the Representatives copies of annual reports and copies of
     all other documents, reports and information furnished by the Company to
     its Stockholders or filed with any securities exchange pursuant to the
     requirements of such exchange or with the Commission pursuant to the Act or
     the Exchange Act. The Company will deliver to the Representatives similar
     reports with respect to significant subsidiaries, as that term is defined
     in the Rules and Regulations, which are not consolidated in the Company's
     financial statements.

          (viii) The Company agrees not to offer, sell, or contract to sell,
     sell short, or otherwise dispose of, directly or indirectly, any shares of
     its Common Stock or any securities convertible into, or exchangeable or
     exercisable for, or derivative of, shares of its Common Stock, for a period
     of 90 days after the date of the Prospectus, except with the prior written
     consent of Alex. Brown & Sons Incorporated and except that the Company may
     issue, and grant options to purchase, shares under its options plans
     existing on the date hereof and disclosed in the Prospectus.

          (ix) The Company will use its best efforts to have the Shares
     designated for trading on the NASDAQ NMS.

          (x) The Company shall cause each executive officer and director of the
     Company to furnish to you, on or prior to the date of this Agreement, a
     letter or letters, in form and substance satisfactory to the Underwriters
     confirming the agreement of each executive officer and director to the
     lock-up restrictions contemplated by Section 1(b)(iv) hereof.

          (xi) The Company shall apply the net proceeds of the sale of the
     Shares as set forth in the Prospectus.

          (xii) The Company shall not invest, or otherwise use the proceeds
     received by the Company from the sale of the Shares to the Underwriters, in
     such a manner as would require the Company or the Subsidiary to register as
     an investment company under the Investment Company Act of 1940, as amended
     (the "1940 Act").

          (xiii) The Company will maintain a transfer agent and, if necessary
     under the jurisdiction of incorporation of the Company or if required for
     NASDAQ NMS designation, a registrar for its Common Shares.

          (xiv) The Company will not take, directly or indirectly, any action
     designed to cause or result in, or that has constituted or might reasonably
     be expected to constitute, the stabilization or manipulation of the price
     of any securities of the Company to facilitate the sale or resale of the
     Shares.

     (b) Each of the Selling Stockholders covenants and agrees with the several
Underwriters and the Company that:

                                      -12-

<PAGE>

          (i) The Selling Stockholder agrees not to offer, sell, or contract to
     sell, sell short, or otherwise dispose of, directly or indirectly, any
     shares of Common Stock beneficially owned by the Selling Stockholder or any
     securities convertible into, or exchangeable or exercisable for, or
     derivative of, shares of Common Stock for a period of 90 days after the
     date of the Prospectus except with the prior written consent of Alex. Brown
     & Sons Incorporated and, in the case of Mr. Paul F. Forman and Mr. Carl A.
     Zanoni only, except that each such Selling Stockholder may exercise
     employee stock options to purchase up to 3,750 shares of Common Stock and
     may sell any or all such 3,750 shares of Common Stock during such 90 day
     period.

          (ii) In order to document the Underwriters' compliance with the
     reporting and withholding provisions of the Tax Equity and Fiscal
     Responsibility Act of 1982 and the Interest and Dividend Tax Compliance Act
     of 1983 with respect to the transaction herein contemplated, each of the
     Selling Stockholders agrees to deliver to you prior to or at the Closing
     Date a properly completed and executed United States Treasury Department
     Form W-9 (or other applicable form or statement specified by Treasury
     Department regulations in lieu thereof).

          (iii) Such Selling Stockholder will not take, directly or indirectly,
     any action designed to cause or result in, or that has constituted or might
     reasonably be expected to constitute, the stabilization or manipulation of
     the price of any securities of the Company to facilitate the sale or resale
     of the Shares.

     5. Costs and Expenses. The Company will pay all costs, expenses and fees
incident to the performance of the obligations of the Sellers under this
Agreement, including, without limiting the generality of the foregoing, the
following: accounting fees of the Company; the fees and disbursements of counsel
for the Company and the Selling Stockholders; the cost of printing and
delivering to, or as requested by, the Underwriters copies of the Registration
Statement, Preliminary Prospectuses, the Prospectus, this Agreement, the
Agreement Among Underwriters, the Underwriters' Selling Memorandum, the
Underwriters' Questionnaire, the Invitation Letter, the Power of Attorney, the
Blue Sky Survey and any supplements or amendments thereto; the filing fees of
the Commission; the filing fees and expenses incident to securing any required
review by the NASD of the terms of the sale of the Shares; the listing fee of
the NASDAQ NMS; and the expenses, including the fees and disbursements of
counsel for the Underwriters, incurred in connection with the qualification of
the Shares under State securities or Blue Sky laws. To the extent, if at all,
that any of the Selling Stockholders engage special legal counsel to represent
them in connection with this offering, the fees and expenses of such counsel
shall be borne by such Selling Stockholder. Any transfer taxes imposed on the
sale of the Shares to the several Underwriters will be paid by the Company and
the Selling Stockholders pro rata. The Company and the Selling Stockholders
shall not, however, be required to pay for any of the Underwriters' expenses
(other than those related to qualification under State securities or Blue Sky
laws) except that, if this Agreement shall not be consummated because the
conditions in Section 7 hereof are not satisfied, or because this Agreement is
terminated by the Representatives pursuant to Section 6 hereof by reason of any
failure, refusal or inability on the part of the Company or the Selling
Stockholders to perform any undertaking or satisfy any condition of this
Agreement or to comply

                                      -13-

<PAGE>


with any of the terms hereof on their part to be performed, unless such failure
to satisfy said condition or to comply with said terms is due to the default or
omission of any Underwriter, then the Company shall reimburse the several
Underwriters for reasonable out-of-pocket expenses, including fees and
disbursements of counsel, reasonably incurred in connection with investigating,
marketing and proposing to market the Shares or in contemplation of performing
their obligations hereunder; but the Company and the Selling Stockholders shall
not in any event be liable to any of the several Underwriters for damages on
account of loss of anticipated profits from the sale by them of the Shares.

     6. Conditions of Obligations of the Underwriters. The several obligations
of the Underwriters to purchase the Firm Shares on the Closing Date and the
Option Shares, if any, on the Option Closing Date are subject to the accuracy,
as of the Closing Date or the Option Closing Date, as the case may be, of the
representations and warranties of the Company and the Selling Stockholders
contained herein, and to the performance by the Company and the Selling
Stockholders of their covenants and obligations hereunder and to the following
additional conditions:

          (a) The Registration Statement and all post-effective amendments
     thereto shall have become effective and any and all filings required by
     Rule 424 and Rule 430A of the Rules and Regulations shall have been made,
     and any request of the Commission for additional information (to be
     included in the Registration Statement or otherwise) shall have been
     disclosed to the Representatives and complied with to their reasonable
     request. No stop order suspending the effectiveness of the Registration
     Statement, as amended from time to time, shall have been issued and no
     proceedings for that purpose shall have been taken or, to the knowledge of
     the Company or the Selling Stockholders, shall be contemplated by the
     Commission.

          (b) The Representatives shall have received on the Closing Date or the
     Option Closing Date, as the case may be, the opinion of Fulbright &
     Jaworski L.L.P., counsel for the Company and the Selling Stockholders,
     dated the Closing Date or the Option Closing Date, as the case may be,
     addressed to the Underwriters to the effect that:

          (i) The Company has been duly organized and is validly existing as a
     corporation in good standing under the laws of the State of Delaware with
     corporate power and authority to own its properties and conduct its
     business as described in the Prospectus; the Subsidiary has been duly
     organized and is validly existing as a corporation in good standing under
     the laws of the jurisdiction of its incorporation, with corporate power and
     authority to own its properties and conduct its business as described in
     the Prospectus; the Company and the Subsidiary are duly qualified to
     transact business in all jurisdictions in which the conduct of their
     business requires such qualification, or in which the failure to qualify
     would have a materially adverse effect upon the business of the Company and
     the Subsidiary taken as a whole; and the outstanding shares of capital
     stock of the Subsidiary have been duly authorized and validly issued, are
     fully paid and non-assessable and are owned by the Company; and, to the
     best of such counsel's knowledge, the outstanding shares of capital stock
     of the Subsidiary are owned free and

                                      -14-
<PAGE>

     clear of all liens, encumbrances and security interests, and no options,
     warrants or other rights to purchase, agreements or other obligations to
     issue or other rights to convert any obligations into any shares of capital
     stock or of ownership interests in the Subsidiary are outstanding.

          (ii) The Company has authorized and outstanding capital stock as set
     forth under the caption "Capitalization" in the Prospectus; the authorized
     shares of its Common Stock have been duly authorized; the outstanding
     shares of its Common Stock, including the Shares to be sold by the Selling
     Stockholders, have been duly authorized and validly issued and are fully
     paid and non-assessable; all of the Shares conform to the description
     thereof contained in the Prospectus; the certificates for the Shares are in
     due and proper form; the shares of Common Stock, including the Option
     Shares, if any, to be sold by the Company pursuant to this Agreement have
     been duly authorized and will be validly issued, fully paid and
     non-assessable when issued and paid for as contemplated by this Agreement;
     and no preemptive rights of stockholders exist with respect to any of the
     Shares or the issue and sale thereof.

          (iii) Except as described in or contemplated by the Prospectus
     (including for purposes of this exception options and purchase rights
     granted, or which could be granted pursuant to existing reservations, under
     stock plans referred to in the notes to the financial statements included
     in the Prospectus), to the knowledge of such counsel, there are no
     outstanding securities of the Company convertible or exchangeable into or
     evidencing the right to purchase or subscribe for any shares of capital
     stock of the Company and there are no outstanding or authorized options,
     warrants or rights of any character obligating the Company to issue any
     shares of its capital stock or any securities convertible or exchangeable
     into or evidencing the right to purchase or subscribe for any shares of
     such stock; and except as described in the Prospectus, to the knowledge of
     such counsel, there is no holder of any securities of the Company or any
     other person who has the right, contractual or otherwise, to cause the
     Company to sell or otherwise issue to them, or to permit them to underwrite
     the sale of, any of the Shares or the right to have any shares of Common
     Stock or other securities of the Company included in the Registration
     Statement or the right, as a result of the filing of the Registration
     Statement, to require registration under the Act of any shares of Common
     Stock or other securities of the Company.

          (iv) The Registration Statement has become effective under the Act
     and, to the best of the knowledge of such counsel, no stop order
     proceedings with respect thereto have been instituted or are pending or
     threatened under the Act.

          (v) The Registration Statement, all Preliminary Prospectuses, the
     Prospectus and each amendment or supplement thereto and documents
     incorporated by reference therein comply as to form in all material
     respects with the requirements of the Act or the Exchange Act, as
     applicable, and the applicable rules and regulations thereunder (except
     that such counsel need express no opinion as to the financial statements,
     schedules and other financial information included or incorporated by
     reference therein).
                                      -15-


<PAGE>


          (vi) The statements under the caption "Principal and Selling
     Stockholders -- Material Relationships of Certain Selling Stockholders with
     the Company" in the Prospectus, and the description of the Company's Common
     Stock contained in its Registration Statement on Form 8-A filed with the
     Commission on October 26, 1984 and incorporated by reference in the
     Prospectus, insofar as such statements constitute a summary of documents
     referred to therein or matters of law, are accurate summaries and fairly
     and correctly present the information called for with respect to such
     documents and matters.

          (vii) Such counsel does not know of any contracts or documents
     required to be filed as exhibits to or incorporated by reference in the
     Registration Statement or described in the Registration Statement or the
     Prospectus which are not so filed, incorporated by reference or described
     as required, and such contracts and documents as are summarized in the
     Registration Statement or the Prospectus are fairly summarized in all
     material respects.

          (viii) After due inquiry, such counsel knows of no material legal
     proceedings pending or threatened against the Company or the Subsidiary
     which might result in any material adverse change in the business or
     financial condition of the Company, except as set forth in the Prospectus.

          (ix) The execution and delivery of this Agreement and the consummation
     of the transactions herein contemplated do not and will not conflict with
     or result in a breach of any of the terms or provisions of, or constitute a
     default under, the Certificate of Incorporation or Bylaws of the Company,
     or any agreement or instrument known to such counsel to which the Company
     or any of the Subsidiaries is a party or by which the Company or any of the
     Subsidiaries may be bound and, in the case of such agreements and
     instruments, which conflict, breach or default if of material significance
     in respect of the business or financial condition of the Company and the
     Subsidiaries taken as a whole.

          (x) This Agreement has been duly authorized, executed and delivered by
     the Company.

          (xi) No approval, consent, order, authorization, designation,
     declaration or filing by or with any regulatory, administrative or other
     governmental body is necessary in connection with the execution and
     delivery of this Agreement and the consummation of the transactions herein
     contemplated (other than as may be required by the NASD or as required by
     State securities and Blue Sky laws as to which such counsel need express no
     opinion) except such as have been obtained or made, specifying the same.

          (xii) The Company is not, and will not become as a result of the
     consummation of the transactions contemplated by this Agreement and the
     initial application of the net proceeds from the sale of the Shares as
     contemplated by the Prospectus, required to register as an investment
     company under the 1940 Act.

                                      -16-

<PAGE>

          (xiii) This Agreement has been duly authorized, executed and delivered
     on behalf of the Selling Stockholders.

          (xiv) Each Selling Stockholder has full legal right, power and
     authority, and any approval required by law (other than as required by
     State securities and Blue Sky laws as to which such counsel need express no
     opinion), to sell, assign, transfer and deliver the portion of the Shares
     to be sold by such Selling Stockholder.

          (xv) The Custody Agreement executed and delivered by each Selling
     Stockholder is an irrevocable instrument that is valid, binding and
     enforceable, in accordance with its terms.

          (xvi) The Underwriters (assuming that they are bona fide purchasers
     within the meaning of the Uniform Commercial Code) have acquired good and
     marketable title to the Shares being sold by each Selling Stockholder on
     the Closing Date, free and clear of all claims, liens, encumbrances and
     security interests whatsoever.

     In rendering such opinion Fulbright & Jaworski L.L.P. may rely as to
matters governed by the laws of states other than Delaware, New York or Federal
laws on local counsel in such jurisdictions and as to the matters set forth in
subparagraphs (xiii), (xiv), (xv), and (xvi) on opinions of other counsel
representing the respective Selling Stockholders, provided that in each case
Fulbright & Jaworski L.L.P. shall state that they believe that they and the
Underwriters are justified in relying on such other counsel. Furthermore, in
rendering an opinion as to matters set forth in subparagraphs (xiii), (xiv),
(xv), and (xvi) (xviii), Fulbright & Jaworski L.L.P. may rely, as to matters of
fact with respect to each Selling Stockholder, upon the representations of such
Selling Stockholder contained in this Agreement and the Custody Agreement of
such Selling Stockholder. In addition to the matters set forth above, such
opinion shall also include a statement to the effect that nothing has come to
the attention of such counsel which leads them to believe that (i) the
Registration Statement, or any amendment thereto, as of the time it became
effective under the Act as of the Closing Date or the Option Closing Date, as
the case may be, (ii) any of the documents incorporated by reference therein, as
of the date of effectiveness of the Registration Statement or, in the case of
documents incorporated by reference in the Prospectus after the date of
effectiveness of the Registration Statement, as of the respective dates when
such documents were filed with the Commission, or (iii) the Prospectus, or any
supplement thereto, on the date it was filed pursuant to the Rules and
Regulations and as of the Closing Date or the Option Closing Date, as the case
may be, contained or contain an untrue statement of a material fact, or omitted
or omit to state a material fact required to be stated therein or necessary to
make the statements therein not misleading (except that such counsel need
express no view as to financial statements, schedules and other financial
information included or incorporated by reference therein or as to the matters
covered by the opinion of special intellectual property counsel referred to in
Section 6(c) of this Agreement). With respect to such statement, Fulbright &
Jaworski L.L.P. may state that their belief is based upon the procedures set
forth therein, but is without independent check and verification.

                                      -17-

<PAGE>

     (c) The Representatives shall have received on the Closing Date or the
Option Closing Date, as the case may be, the opinion of Bryan Cave, special
intellectual property counsel for the Company, dated the Closing Date or the
Option Closing Date, as the case may be, addressed to the Underwriters to the
effect that:

          (i) The statements under the captions "Risk Factors -- Dependence on
     Proprietary Technology," "Business -- Patents and Other Intellectual
     Property Rights," "Business -- Zygo Strategy -- Maintain Enhanced
     Leadership Through Innovative Technical Solutions" and "Business -- Legal
     Proceedings", to the extent they constitute or relate to matters of United
     States law, summaries of legal matters governed by United States law,
     documents or proceedings governed by United States law, or legal
     conclusions governed by United States law, are accurate and correct in all
     material respects;

          (ii) To the best of such counsel's knowledge, the Company or one of
     its Subsidiaries, as the case may be, is the owner of all right, title and
     interest to the patents and applications described in the prospectus, which
     patents and applications are listed in an appendix to such opinion;

          (iii) To the best of such counsel's knowledge, with respect to the
     validity and enforceability of each patent and each patent application
     owned by the Company or any of its subsidiaries, as the case may be (A) all
     material prior art and other material information was accurately disclosed
     in the pertinent patent application; (B) no knowing misrepresentation of
     material fact was made, and no knowing concealment of any material fact
     occurred, in the prosecution of any such patent application; and (C) such
     counsel is not aware of any information which would compel a court to hold
     that any issued patent or allowed claim is invalid or unenforceable; and

          (iv) Other than as disclosed in the Prospectus, there are no inter
     partes proceedings now pending or threatened, to which the Company or any
     of its subsidiaries is a party, before the United States Patent or
     Trademark Office or comparable governmental bodies in foreign countries, or
     before any court, relating to or affecting the subject matter of the
     Company's patents or patent applications.

     (d) The Representatives shall have received from Piper & Marbury L.L.P.,
counsel for the Underwriters, an opinion dated the Closing Date or the Option
Closing Date, as the case may be, substantially to the effect specified in
subparagraphs (ii), (iii), (iv), (v), (x), (xiii) and (xvi) of Paragraph (b) of
this Section 6, and that the Company is a validly organized and existing
corporation under the laws of the State of Delaware. In rendering such opinion
Piper & Marbury L.L.P. may rely as to all matters governed other than by the
laws of the State of Maryland, State of New York, Delaware corporate or Federal
laws on the opinion of counsel referred to in paragraph (b) of this Section 6.
In addition to the matters set forth above, such opinion shall also include a
statement to the effect that nothing has come to the attention of such counsel
which leads them to believe that (i) the Registration Statement, or any
amendment thereto, as of the time it became effective under the Act or as of the
Closing Date or the Option Closing Date, as

                                      -18-

<PAGE>


the case may be, (ii) any of the documents incorporated by reference
therein, as of the date of effectiveness of the Registration Statement or, in
the case of documents incorporated by reference in the Prospectus after the date
of effectiveness of the Registration Statement, as of the respective dates when
such documents were filed with the Commission, or (iii) the Prospectus, or any
supplement thereto, on the date it was filed pursuant to the Rules and
Regulations and as of the Closing Date or the Option Closing Date, as the case
may be, contained or contain an untrue statement of a material fact, or omitted
or omit to state a material fact required to be stated therein or necessary to
make the statements therein not misleading (except that such counsel need
express no view as to financial statements, schedules and other financial
information included or incorporated by reference therein). With respect to such
statement, Piper & Marbury L.L.P. may state that their belief is based upon the
procedures set forth therein, but is without independent check and verification.

         (e) The Representatives shall have received at or prior to the Closing
Date from Piper & Marbury L.L.P. a memorandum or summary, in form and substance
satisfactory to the Representatives, with respect to the qualification for
offering and sale by the Underwriters of the Shares under the State securities
or Blue Sky laws of such jurisdictions as the Representatives may reasonably
have designated to the Company.

     (f) The Representatives shall have received, on each of the dates hereof,
the Closing Date or the Option Closing Date, as the case may be, a letter dated
the date thereof of KPMG Peat Marwick L.L.P., confirming that they are
independent public accountants within the meaning of the Act and the applicable
published Rules and Regulations thereunder and stating that in their opinion the
financial statements and schedules examined by them and included in the
Registration Statement comply in form in all material respects with the
applicable accounting requirements of the Act and the related published Rules
and Regulations; and containing such other statements and information as is
ordinarily included in accountants' "comfort letters" to Underwriters with
respect to the financial statements and certain financial information contained
in the Registration Statement and Prospectus.

     (g) The Representatives shall have received on the Closing Date or the
Option Closing Date, as the case may be, a certificate or certificates of the
President and Chief Executive Officer and the Vice President, Finance &
Administration and Chief Financial Officer of the Company to the effect that, as
of the Closing Date or the Option Closing Date, as the case may be, each of them
severally represents as follows:

          (i) The Registration Statement has become effective under the Act and
     no stop order suspending the effectiveness of the Registration Statement
     has been issued, and no proceedings for such purpose have been taken or
     are, to his knowledge, contemplated by the Commission.

          (ii) Such officer does not know of any litigation instituted or
     threatened against the Company of a character required to be disclosed in
     the Registration Statement which is not so disclosed; such officer does not
     know of any material contract required to

                                      -19-

<PAGE>


be filed as an exhibit to the Registration Statement which is not so filed;
and the representations and warranties of the Company contained in Section 1(a)
hereof are true and correct as of the Closing Date or the Option Closing Date,
as the case may be.

          (iii) All filings required to have been made pursuant to Rules 424 or
     430A under the Act have been made.

          (iv) Such officer has carefully examined the Registration Statement
     and the Prospectus and, in such officer's opinion, as of the effective date
     of the Registration Statement, the statements contained in the Registration
     Statement, including any document incorporated by reference therein, were
     true and correct, and such Registration Statement and Prospectus or any
     document incorporated by reference therein did not omit to state a material
     fact required to be stated therein or necessary in order to make the
     statements therein not misleading and, in such officer's opinion, since the
     effective date of the Registration Statement, no event has occurred which
     should have been set forth in a supplement to or an amendment of the
     Prospectus which has not been so set forth in such supplement or amendment.

          (v) Since the respective dates as of which information is given in the
     Registration Statement and the Prospectus, there has not been any material
     adverse change or any development involving a prospective material adverse
     change in or affecting the condition, financial or otherwise, of the
     Company and the Subsidiaries taken as a whole or the earnings, business
     affairs, management or business prospects of the Company and the
     subsidiaries taken as a whole, whether or not arising in the ordinary
     course of business.

     (h) The Company and the Selling Stockholders shall have furnished to the
Representatives such further certificates and documents confirming the
representations and warranties contained herein and related matters as the
Representatives may reasonably have requested.

     (i) The Firm Shares, and Option Shares, if any, have been approved for
listing upon official notice of issuance on the NASDAQ NMS.

     (j) The Company shall have delivered to you written agreements (the "Lockup
Agreements") described in Section 4(a)(x).

     The opinions and certificates mentioned in this Agreement shall be deemed
to be in compliance with the provisions hereof only if they are in all material
respects satisfactory to the Representatives and to Piper & Marbury L.L.P.,
counsel for the Underwriters.

     If any of the conditions hereinabove provided for in this Section 6 shall
not have been fulfilled when and as required by this Agreement to be fulfilled,
the obligations of the Underwriters hereunder may be terminated by the
Representatives by notifying the Company and

                                      -20-

<PAGE>

the Selling Stockholders of such termination in writing or by telegram at
or prior to the Closing Date or the Option Closing Date, as the case may be.

     In such event, the Selling Stockholders, the Company and the Underwriters
shall not be under any obligation to each other (except to the extent provided
in Sections 5 and 8 hereof).

     7. Conditions of the Obligations of the Sellers. The obligations of the
Sellers to sell and deliver the portion of the Shares required to be delivered
as and when specified in this Agreement are subject to the conditions that at
the Closing Date or the Option Closing Date, as the case may be, no stop order
suspending the effectiveness of the Registration Statement shall have been
issued and in effect or proceedings therefor initiated or threatened.

     8. Indemnification

     (a) The Company agrees to indemnify and hold harmless each Underwriter and
each person, if any, who controls any Underwriter within the meaning of the Act
against any losses, claims, damages or liabilities to which such Underwriter or
such controlling person may become subject under the Act or otherwise, insofar
as such losses, claims, damages or liabilities (or actions or proceedings in
respect thereof) arise out of or are based upon (i) any untrue statement or
alleged untrue statement of any material fact contained or incorporated by
reference in the Registration Statement, any Preliminary Prospectus, the
Prospectus or any amendment or supplement thereto, or (ii) the omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, and will reimburse
each Underwriter and each such controlling person for any legal or other
expenses reasonably incurred by such Underwriter or such controlling person in
connection with investigating or defending any such loss, claim, damage,
liability, action or proceeding and expenses reasonable incurred in responding
to a subpoena or governmental inquiry whether or not such underwriter or
controlling person is a party to any action or proceeding; provided, however,
that the Company will not be liable in any such case to the extent that any such
loss, claim, damage or liability arises out of or is based upon an untrue
statement or alleged untrue statement, or omission or alleged omission made or
incorporated by reference in the Registration Statement, any Preliminary
Prospectus, the Prospectus, or such amendment or supplement, in reliance upon
and in conformity with written information furnished to the Company by or
through the Representatives specifically for use in the preparation thereof;
provided further, that the indemnity agreement contained in this Section with
respect to any Preliminary Prospectus will not inure to the benefit of any
Underwriter (or of any person controlling such Underwriter) on account of any
loss, claim, damage, liability, action or proceeding arising out of or based
upon an untrue statement or alleged untrue statement of a material fact, or
omission or alleged omission of a material fact, made therein, with respect to
the sale of the Shares by such Underwriter to any person if a copy of a
Preliminary Prospectus or Prospectus or any amendment or supplement thereto (if
any amendment or supplement thereto shall have been furnished to such
Underwriter) correcting such untrue statement or alleged untrue statement or
omission or alleged omission shall not have been given or sent to such person by
or on behalf of such Underwriter with or prior to the written confirmation of
the sale involved. This indemnity agreement will be

                                      -21-

<PAGE>

in addition to any liability which the Company may otherwise have,
including without limitations any obligations the Company has to indemnify the
Selling Stockholders under the Registration Rights Agreement dated November 30,
1993 or otherwise.

     (b) The Selling Stockholders, severally and not jointly, agree to indemnify
and hold harmless each Underwriter and each person, if any, who controls any
Underwriter within the meaning of the Act against any losses, claims, damages or
liabilities to which such Underwriter or such controlling person may become
subject under the Act or otherwise, insofar as such losses, claims, damages or
liabilities (or actions or proceedings in respect thereof) arise out of or are
based upon (i) any untrue statement or alleged untrue statement of any material
fact contained or incorporated by reference in the Registration Statement, any
Preliminary Prospectus, the Prospectus or any amendment or supplement thereto,
or (ii) the omission or alleged omission to state therein a material fact
required to be stated therein or necessary to make the statements therein not
misleading, and will reimburse each Underwriter and each such controlling person
for any legal or other expenses reasonably incurred by such Underwriter or such
controlling person in connection with investigating or defending any such loss,
claim, damage, liability, action or proceeding and expenses reasonable incurred
in responding to a subpoena or governmental inquiry whether or not such
underwriter or controlling person is a party to any action or proceeding;
provided, however, that a Selling Stockholder will be liable under this Section
8(b) only to the extent that any such loss, claim, damage or liability arises
out of or is based upon an untrue statement or alleged untrue statement, or
omission or alleged omission made or incorporated by reference in the
Registration Statement, any Preliminary Prospectus, the Prospectus, or such
amendment or supplement, in reliance upon and in conformity with information
furnished to the Company by or through such Selling Stockholder specifically for
use in the preparation thereof; provided further, that the indemnity agreement
contained in this Section 8(b) with respect to any Preliminary Prospectus will
not inure to the benefit of any Underwriter (or of any person controlling such
Underwriter) on account of any loss, claim, damage, liability, action or
proceeding arising out of or based upon an untrue statement or alleged untrue
statement of a material fact, or omission or alleged omission of a material
fact, made therein, with respect to the sale of the Shares by such Underwriter
to any person if a copy of a Preliminary Prospectus or Prospectus or any
amendment or supplement thereto (if any amendment or supplement thereto shall
have been furnished to such Underwriter) correcting such untrue statement or
alleged untrue statement or omission or alleged omission shall not have been
given or sent to such person by or on behalf of such Underwriter with or prior
to the written confirmation of the sale involved. In no event, however, shall
the liability of any Selling Stockholder for indemnification under this Section
8(b) exceed the lesser of (i) that proportion of the total of such losses,
claims, damages or liabilities indemnified against equal to the proportion of
the total Shares sold hereunder which is being sold by such Selling Stockholder,
or (ii) the proceeds received by such Selling Stockholder from the Underwriters
in the offering. This indemnity agreement will be in addition to any liability
which the Selling Stockholders may otherwise have.

                                      -22-

<PAGE>

     (c) Each Underwriter will indemnify and hold harmless the Company, each of
its directors, each of its officers who have signed the Registration Statement,
the Selling Stockholders, and each person, if any, who controls the Company or
the Selling Stockholders within the meaning of the Act, against any losses,
claims, damages or liabilities to which the Company or any such director,
officer, Selling Stockholder or controlling person may become subject under the
Act or otherwise, insofar as such losses, claims, damages or liabilities (or
actions or proceedings in respect thereof) arise out of or are based upon any
untrue statement or alleged untrue statement of any material fact contained or
incorporated by reference in the Registration Statement, any Preliminary
Prospectus, the Prospectus or any amendment or supplement thereto, or arise out
of or are based upon the omission or the alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein not misleading in the light of the circumstances under which they were
made; and will reimburse any legal or other expenses reasonably incurred by the
Company or any such director, officer, Selling Stockholder or controlling person
in connection with investigating or defending any such loss, claim, damage,
liability, action or proceeding; provided, however, that each Underwriter will
be liable in each case to the extent, but only to the extent, that such untrue
statement or alleged untrue statement or omission or alleged omission has been
made or incorporated by reference in the Registration Statement, any Preliminary
Prospectus, the Prospectus or such amendment or supplement, in reliance upon and
in conformity with written information furnished to the Company by or through
the Representatives specifically for use in the preparation thereof. This
indemnity agreement will be in addition to any liability which such Underwriter
may otherwise have.

     (d) In case any proceeding (including any governmental investigation) shall
be instituted involving any person in respect of which indemnity may be sought
pursuant to this Section 8, such person (the "indemnified party") shall promptly
notify the person against whom such indemnity may be sought (the "indemnifying
party") in writing. No indemnification provided for in Section 8(a), (b) or (c)
shall be available to any party who shall fail to give notice as provided in
this Section 8(d) if the party to whom notice was not given was unaware of the
proceeding to which such notice would have related and was materially prejudiced
by the failure to give such notice, but the failure to give such notice shall
not relieve the indemnifying party or parties from any liability which it or
they may have to the indemnified party for contribution or otherwise than on
account of the provisions of Section 8(a), (b) or (c). In case any such
proceeding shall be brought against any indemnified party and it shall notify
the indemnifying party of the commencement thereof, the indemnifying party shall
be entitled to participate therein and, to the extent that it shall wish,
jointly with any other indemnifying party similarly notified, to assume the
defense thereof, with counsel reasonably satisfactory to such indemnified party
and shall pay as incurred the fees and disbursements of such counsel related to
such proceeding. In any such proceeding, any indemnified party shall have the
right to retain its own counsel at its own expense. Notwithstanding the
foregoing, the indemnifying party shall pay as incurred the fees and expenses of
the counsel retained by the indemnified party in the event (i) the indemnifying
party and the indemnified party shall have mutually agreed to the retention of
such counsel or (ii) the named parties to any such proceeding (including any
impleaded parties)

                                      -23-

<PAGE>

include both the indemnifying party and the indemnified party and
representation of both parties by the same counsel would be inappropriate due to
actual or potential differing interests between them. It is understood that the
indemnifying party shall not, in connection with any proceeding or related
proceedings in the same jurisdiction, be liable for the reasonable fees and
expenses of more than one separate counsel for all such indemnified parties.
Such firm shall be designated in writing by you in the case of parties
indemnified pursuant to Section 8(a) or (b) and by the Company and the Selling
Stockholders in the case of parties indemnified pursuant to Section 8(c). The
indemnifying party shall not be liable for any settlement of any proceeding
effected without its written consent but if settled with such consent or if
there be a final judgment for the plaintiff, the indemnifying party agrees to
indemnify the indemnified party from and against any loss or liability by reason
of such settlement or judgment. In addition, the indemnifying party will not,
without the prior written consent of the indemnified party, settle or compromise
or consent to the entry of any judgment in any pending or threatened claim,
action or proceeding of which indemnification may be sought hereunder (whether
or not any indemnified party is an actual or potential party to such claim,
action or proceeding) unless such settlement, compromise or consent includes an
unconditional release of each indemnified party from all liability arising out
of such claim, action or proceeding.

     (e) If the indemnification provided for in this Section 8 is unavailable or
insufficient to hold harmless an indemnified party under Section 8(a), (b) or
(c) above in respect of any losses, claims, damages or liabilities (or actions
or proceedings in respect thereof) referred to therein, then each indemnifying
party shall contribute to the amount paid or payable by such indemnified party
as a result of such losses, claims, damages or liabilities (or actions or
proceedings in respect thereof) in such proportion as is appropriate to reflect
the relative benefits received by the Company and the Selling Stockholders on
the one hand and the Underwriters on the other from the offering of the Shares.
If, however, the allocation provided by the immediately preceding sentence is
not permitted by applicable law or if the indemnified party failed to give the
notice required under Section 8(d) above, then each indemnifying party shall
contribute to such amount paid or payable by such indemnified party in such
proportion as is appropriate to reflect not only such relative benefits but also
the relative fault of the Company and the Selling Stockholders on the one hand
and the Underwriters on the other in connection with the statements or omissions
which resulted in such losses, claims, damages or liabilities (or actions or
proceedings in respect thereof), as well as any other relevant equitable
considerations. The relative benefits received by the Company and the Selling
Stockholders on the one hand and the Underwriters on the other shall be deemed
to be in the same proportion as the total net proceeds from the offering (before
deducting expenses) received by the Company and the Selling Stockholders bear to
the total underwriting discounts and commissions received by the Underwriters,
in each case as set forth in the table on the cover page of the Prospectus. The
relative fault shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement of a material fact or the omission or
alleged omission to state a material fact relates to information supplied by the
Company or the Selling Stockholders on the one hand or the Underwriters on the
other and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission.

                                      -24-

<PAGE>

     The Company, the Selling Stockholders and the Underwriters agree that it
would not be just and equitable if contributions pursuant to this Section 8(e)
were determined by pro rata allocation (even if the Underwriters were treated as
one entity for such purpose) or by any other method of allocation which does not
take account of the equitable considerations referred to above in this Section
8(e). The amount paid or payable by an indemnified party as a result of the
losses, claims, damages or liabilities (or actions or proceedings in respect
thereof) referred to above in this Section 8(e) shall be deemed to include any
legal or other expenses reasonably incurred by such indemnified party in
connection with investigating or defending any such action or claim.
Notwithstanding the provisions of this subsection (e), (i) no Underwriter shall
be required to contribute any amount in excess of the underwriting discounts and
commissions applicable to the Shares purchased by such Underwriter, (ii) no
person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation, and (iii) no Selling Stockholder
shall be required to contribute any amount in excess of the lesser of (A) that
proportion of the total of such losses, claims, damages or liabilities
indemnified or contributed against equal to the proportion of the total Shares
sold hereunder which is being sold by such Selling Stockholder, or (B) the
proceeds received by such Selling Stockholder from the Underwriters in the
offering. The Underwriters' obligations in this Section 8(e) to contribute are
several in proportion to their respective underwriting obligations and not
joint.

     (f) In any proceeding relating to the Registration Statement, any
Preliminary Prospectus, the Prospectus or any supplement or amendment thereto,
each party against whom contribution may be sought under this Section 8 hereby
consents to the jurisdiction of any court having jurisdiction over any other
contributing party, agrees that process issuing from such court may be served
upon him or it by any other contributing party and consents to the service of
such process and agrees that any other contributing party may join him or it as
an additional defendant in any such proceeding in which such other contributing
party is a party.

     9. Default by Underwriters. If on the Closing Date or the Option Closing
Date, as the case may be, any Underwriter shall fail to purchase and pay for the
portion of the Shares which such Underwriter has agreed to purchase and pay for
on such date (otherwise than by reason of any default on the part of the Company
or a Selling Stockholder), you, as Representatives of the Underwriters, shall
use your best efforts to procure within 36 hours thereafter one or more of the
other Underwriters, or any others, to purchase from the Company and the Selling
Stockholders such amounts as may be agreed upon and upon the terms set forth
herein, the Firm Shares or Option Shares, as the case may be, which the
defaulting Underwriter or Underwriters failed to purchase. If during such 36
hours you, as such Representatives, shall not have procured such other
Underwriters, or any others, to purchase the Firm Shares or Option Shares, as
the case may be, agreed to be purchased by the defaulting Underwriter or
Underwriters, then (a) if the aggregate number of shares with respect to which
such default shall occur does not exceed 10% of the Firm Shares or Option
Shares, as the case may be, covered hereby, the other Underwriters shall be
obligated, severally, in proportion to the respective numbers of Firm Shares or
Option Shares, as the case may be, which they are obligated to

                                      -25-

<PAGE>

purchase hereunder, to purchase the Firm Shares or Option Shares, as the
case may be, which such defaulting Underwriter or Underwriters failed to
purchase, or (b) if the aggregate number of shares of Firm Shares or Option
Shares, as the case may be, with respect to which such default shall occur
exceeds 10% of the Firm Shares or Option Shares, as the case may be, covered
hereby, the Company and the Selling Stockholders or you as the Representatives
of the Underwriters will have the right, by written notice given within the next
36-hour period to the parties to this Agreement, to terminate this Agreement
without liability on the part of the non-defaulting Underwriters or of the
Company or of the Selling Stockholders except to the extent provided in Section
8 hereof. In the event of a default by any Underwriter or Underwriters, as set
forth in this Section 9, the Closing Date or Option Closing Date, as the case
may be, may be postponed for such period, not exceeding seven days, as you, as
Representatives, may determine in order that the required changes in the
Registration Statement or in the Prospectus or in any other documents or
arrangements may be effected. The term "Underwriter" includes any person
substituted for a defaulting Underwriter. Any action taken under this Section 9
shall not relieve any defaulting Underwriter from liability in respect of any
default of such Underwriter under this Agreement.

     10. Notices. All communications hereunder shall be in writing and, except
as otherwise provided herein, will be mailed, delivered or telegraphed or
telecopied and confirmed as follows: if to the Underwriters, to Alex. Brown &
Sons Incorporated, 135 East Baltimore Street, Baltimore, Maryland 21202,
Attention: Peter M. McGowan; if to the Company or the Selling Stockholders, to
Gary K. Willis, President, Zygo Corporation, Laurel Brook Road, Middlefield,
Connecticut 06455-0488.

     11. Termination. This Agreement may be terminated by you by notice to the
Sellers as follows:

          (a) at any time prior to the earlier of (i) the time the Firm Shares
     are released by you for sale by notice to the Underwriters, or (ii) 11:30
     A.M. on the first business day following the date of this Agreement;

          (b) at any time after the date hereof if any of the following has
     occurred: (i) since the respective dates as of which information is given
     in the Registration Statement and the Prospectus, any material adverse
     change or any development involving a prospective material adverse change
     in or affecting the condition, financial or otherwise, of the Company and
     its Subsidiaries taken as a whole or the earnings, business affairs,
     management or business prospects of the Company and its Subsidiaries taken
     as a whole, whether or not arising in the ordinary course of business, (ii)
     any outbreak or escalation of hostilities or declaration of war or national
     emergency after the date hereof or other national or international calamity
     or crisis or change in economic or political conditions if the effect of
     such outbreak, escalation, declaration, emergency, calamity, crisis or
     change on the financial markets of the United States would, in your
     reasonable judgment, make the offering or delivery of the Shares
     impracticable or inadvisable, (iii) suspension of trading in securities on
     the New York Stock Exchange or the American Stock Exchange or limitation on
     prices (other than limitations on hours or numbers of

                                      -26-

<PAGE>

     days of trading) for securities on either such Exchange, (iv) the
     enactment, publication, decree or other promulgation of any federal or
     state statute, regulation, rule or order of any court or other governmental
     authority which in your reasonable opinion materially and adversely affects
     or will materially or adversely affect the business or operations of the
     Company, (v) declaration of a banking moratorium by either United States or
     New York State authorities, (vi) any downgrading of the rating of the
     Company's debt securities by any "nationally recognized statistical rating
     organization" (as defined for purposes of Rule 436(g) under the Exchange
     Act), (vii) the suspension of trading of the Company's Common Stock by the
     NASD, (viii) the taking of any action by any federal, state or local
     government or agency in respect of its monetary or fiscal affairs which in
     your reasonable opinion has a material adverse effect on the securities
     markets in the United States; or (ix) any litigation or proceeding is
     pending or threatened against the Underwriters which seeks to enjoin or
     otherwise restrain or seeks damages in connection with, or questions the
     legality or validity of, this Agreement or the transactions contemplated
     hereby; or

     (c) as provided in Sections 6 and 9 of this Agreement.

     This Agreement also may be terminated by you, by notice to the Company and
the Selling Stockholders, as to any obligation of the Underwriters to purchase
the Option Shares, upon the occurrence at any time prior to the Option Closing
Date of any of the events described in subparagraph (b) above or as provided in
Sections 6 and 9 of this Agreement.

     12. Successors. This Agreement has been and is made solely for the benefit
of the Underwriters, the Company and the Selling Stockholders and their
respective successors, executors, administrators, heirs and assigns, and the
officers, directors and controlling persons referred to herein, and no other
person will have any right or obligation hereunder. The term "successors" shall
not include any purchaser of the Shares merely because of such purchase.

     13. Information Provided by Underwriters. The Company, the Selling
Stockholders and the Underwriters acknowledge and agree that the only
information furnished or to be furnished by any Underwriter to the Company for
inclusion in any Prospectus or the Registration Statement consists of the
information set forth in the last paragraph on the front cover page of the
Prospectus (insofar as such information relates to the Underwriters),
information provided in connection with Item 502(d) of Regulation S-K under the
Act and under the caption "Underwriting" in the Prospectus.

     14. Miscellaneous. The reimbursement, indemnification and contribution
agreements contained in this Agreement and the representations, warranties and
covenants in this Agreement shall remain in full force and effect regardless of
(a) any termination of this Agreement, (b) any investigation made by or on
behalf of any Underwriter or controlling person thereof, or by or on behalf of
the Company or its directors or officers or the Selling Stockholders, and (c)
delivery of and payment for the Shares under this Agreement.

                                      -27-

<PAGE>


     This Agreement may be executed in two or more counterparts, each of which
shall be deemed an original, but all of which together shall constitute one and
the same instrument.

     This Agreement shall be governed by, and construed in accordance with, the
laws of the State of Maryland.

     If the foregoing letter is in accordance with your understanding of our
agreement, please sign and return to us the enclosed duplicates hereof,
whereupon it will become a binding agreement among the Selling Stockholders, the
Company and the several Underwriters in accordance with its terms. It is
understood that your acceptance of this letter on behalf of each of the
Underwriters is pursuant to the authority set forth in a form of Agreement among
Underwriters, the form of which shall be submitted to the Company and the
Selling Stockholders for examination, upon request, but without warranty on your
part as to the authority of the signers thereof.

                                      -28-

<PAGE>


     Any person executing and delivering this Agreement as Attorney-in-Fact for
a Selling Stockholder represents by so doing that he has been duly appointed as
Attorney-in-Fact by such Selling Stockholder pursuant to a validly existing and
binding Power of Attorney which authorized such Attorney-in-Fact to take such
action.


                                        Very truly yours,

                                        ZYGO CORPORATION

                                        By:_____________________________

                                        Selling Stockholders listed on
                                          Schedule II

                                       By:______________________________
                                          ________, Attorney-in-Fact





                                      -29-

<PAGE>



The foregoing Underwriting Agreement
is hereby confirmed and accepted as
of the date first above written.

ALEX. BROWN & SONS INCORPORATED
NEEDHAM & COMPANY, INC.
UNTERBERG HARRIS

As Representatives of the
several Underwriters listed
on Schedule I

By: ALEX. BROWN & SONS INCORPORATED



By:____________________________
      Authorized Officer


                                      -30-

<PAGE>


                                   SCHEDULE I

                            Schedule of Underwriters



                                                    Number of Firm Shares
                Underwriter                            to be Purchased
                -----------                         ---------------------

    Alex. Brown & Sons Incorporated .............
    Needham & Company, Inc. .....................
    Unterberg Harris ............................


                                                          ---------
                       Total ....................         1,600,000
                                                          =========


                                      -31-

<PAGE>


                                   SCHEDULE II


                        Schedule of Selling Stockholders



       Selling Stockholder                       Number of Shares to be Sold
       -------------------                       ---------------------------

    Canon Inc. ..................................           300,000
    Wesleyan University .........................           225,000
    Paul F. Forman ..............................            75,000
    Sol F. Laufer ...............................            70,000
    Carl A. Zanoni ..............................            60,000
    Robert G. McKelvey ..........................            25,000
                                                            -------
                       Total ....................           755,000
                                                            =======



   
                                                                     EXHIBIT 5.1

                              FULBRIGHT & JAWORSKI
                                     L.L.P.
                   A Registered Limited Liability Partnership
                               666 Fifth Avenue
                         New York, New York 10103-3198

                                                               December 8, 1995

Zygo Corporation
Laurel Brook Road
Middlefield, Connecticut 06455-0448

Dear Sirs:

     In connection with the Registration Statement on Form S-3, Registration
No. 33-63775 (the "Registration Statement"), filed by Zygo Corporation, a
Delaware corporation (the "Company"), under the Securities Act of 1933, as
amended (the "Act"), relating to the public offering of an aggregate of up to
1,840,000 shares of the Company's Common Stock, par value $0.10 per share (the
"Common Stock"), of which 1,085,000 shares of authorized but heretofore unissued
shares of Common Stock (including up to 240,000 shares of Common Stock which
will be purchased by the underwriters if the underwriters exercise the option
granted to them by the Company to cover over-allotments, if any) are being
offered by the Company and 755,000 presently issued and outstanding shares of
Common Stock are being offered severally by certain selling stockholders
(collectively, the "Selling Stockholders"), we, as counsel for the Company,
have examined such corporate records, other documents and questions of law as we
have considered necessary or appropriate for the purposes of this opinion. Our
opinion set forth below is limited to the General Corporation Law of the State
of Delaware.

     We assume that appropriate action will be taken, prior to the offer and
sale of the shares of Common Stock, to register and qualify such shares for sale
under all applicable state securities or "blue sky" laws.

     In our examination of the foregoing documents, we have assumed the
genuineness of all signatures and the authenticity of all documents submitted to
us as originals, the conformity to original documents of all documents submitted
to us as certified or photostatic copies, and the authenticity of the originals
of such latter documents.

     Based on the foregoing, we advise you that in our opinion (i) the shares of
Common Stock being issued and sold by the Company have been duly and validly
authorized and, when issued and sold in the manner contemplated by the
Underwriting Agreement, a form of which has been filed as an exhibit to the
Registration Statement (the "Underwriting Agreement"), and upon receipt by the
Company of payment therefor as provided in the Underwriting Agreement, will be
legally issued, fully paid and non-assessable, and (ii) the shares of Common
Stock being sold by the Selling Stockholders have been duly and validly
authorized and are legally issued, fully paid and non-assessable.

     We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement and the reference to this firm under the caption "Legal
Matters" in the Prospectus contained therein. This consent is not to be
construed as an admission that we are a party whose consent is required to be
filed with the Registration Statement under the provisions of the Act or the
rules and regulations of the Securities and Exchange Commission promulgated
thereunder.

     The opinion expressed herein is solely for your benefit, and may be relied
upon only by you.

                                                Very truly yours,


                                                Fulbright & Jaworski L.L.P.
    


                                                                    EXHIBIT 23.1


              CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS




The Board of Directors and Stockholders of
  Zygo Corporation:

     We consent to the use of our report included herein and to the reference to
our firm under the headings "Selected Consolidated Financial Data" and "Experts"
in the prospectus.



   
KPMG Peat Marwick LLP
Hartford, Connecticut
December 8, 1995
    



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