DEAR ART:

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A000600020009-5
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 4
• Document Creation Date: December 28, 2016
• Document Release Date: December 21, 2001
• Sequence Number: 9
• Publication Date: July 26, 1961
• Content Type: LETTER

STATINTL
Approved For Release 2002/06/17 : CIA-RDP78BO4747A000600020009-5
STATINTL
26 July 1961
I am enclosing three copies of an optical stretch-out of a
proposed 8" F/2.0, l:l relay lens in accordance with our discussion
STATINTL with This lens is a straight forward development of
our 2: reduction lens, modified for 70 millimeter format.
I have traced this system at P/2.0 and P/3.0 and find that
at each of these relative apertures, diffraction limited imagery is
obtained. The aerial image resolution of the aforementioned relative STATINTL
apertures are 349 1/mm and 232 1/mm respectively.
Since our investigations of the reliability of empirical
expression for lens-film resolution seems reliable for shoe
conjugate systems, the predicted resolution on 80 243 are as follows:
At P/2.0
Low contrast1 145.8 1/mm
High contrast: 220.8 1/mm
STATINTL
It should be noted that SO 243, which is somewhat better than
Miorofile, has a resolution capability of 500-600 1 /mm under high con-
trast conditions. You will remember that indicated the
availability of Panochromatic film which will resolve a thousand lines
or better. If we could obtain more information about this emulsion,
and find that a thousand 1/mm can be obtained' then the 1:1 lens we
are proposing would conceivably resolve 340 1/mm.
STATINTL I think
Declass Review by NIMA/DOD
desires are in this neighborhood, namely
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300-400 lines. Please note that resolution expression of this
magnitude is limited by the state of the art and is then near a
maximum value.
Very truly yours?
R.TH/bb
Enclosures 3
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 STATINTL
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July 24, 1961
STATINTL
Central Intelligence Agency
ashington 25, L. C.
.'object:
STATINTL Attention:
Gentlemen:
STATINTL
curing our discussion on July 20, 1961 with your technical personnel
concerning the above subject contract, it became apparent that the re-
quirement for the 2:1 Reduction Lens on contract has been projected
forward to a future planning period. A somewhat more immediate re-
quirement was discussed and we indicated that our existing design could
he readily modified to satisfy the needs of a 1:1 70 mm Reproduction
.,ens and other applications.
Y our people indicated that prior to any further action with regard to the
1:1 Lens, it would be desirable to modify the scope of the contract to
eliminate the hardware and re-define the scope to include the following
engineering data:
(a) Detail Drawings of the optical design.
(b) Complete tolerance analysis.
(c) Outline drawing of suggested mounting.y C
(d) Results of a company sponsored film study.
(e) Suggested applications of the existing optical design...'
The costs expended to accomplish the above would be combined with our
actual costs to date, and together would provide the basis for the final
contract price.
The following is our total estimated costs:
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Y
Central Intelligence Agency
Washington 25, D. C.
July 24, 1961
Page No. 2
STATINTL
We estimate a total of eight (8) weeks after authorization are necessary to
finalize the remaining phases of our contract in accordance with the revised
scope and to deliver our final engineering report.
%, e would be very pleased to receive your comments with regard to our
latest plan and we would like to again express our desire to supply you
with any additional data you may need.
Very truly yours,
JWS:mU
Contracts agar
STATINTL
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