ZOOM (6X TO 60X) PROJECTION LENS FOR MONOCHROMATIC LIGHT

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A000800050005-5
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 4
• Document Creation Date: December 28, 2016
• Document Release Date: January 19, 2005
• Sequence Number: 5
• Publication Date: May 31, 1966
• Content Type: REPORT

Approved Folease 2005/02/S{eR1EP78B0477 000800050005-5
For e F_ 1 4- 110
FY-66 Quarterly Report No. 4
9 7 O 5
PAR 233
31 May 66
SUBJECT: Zoom (6X to 60X) Projection Lens for Monochromatic Light
TASK/PROBLEM
1. Investigate the possibility of designing a 6X to 60X Zoom
Projection Lens for Monochromatic Light.
DISCUSSION
2. Following a visit by the customer's representative on 28 Feb 66,
our lens designers found that the use of a "light flint" glass in place
of the "dense flint" considered previously could increase the system
transmittance to the order of 5031 at 3560A. The possibility of using
this glass is provided by attempting correction of the system for a
narrower spectral range (3600A to 3700A) than previously considered..
3. On 22 Mar 66, a contractor's representative visited the cus-
tomer's facility to review this project, among others. It was pointed
out in that conference than the UV-sensitive screen proposed for use
with this lens is not an amplifying (image-intensifier) screen; hence,
the energy radiated from the screen as an image is supplied, entirely
by the projected energy upon the screen. In this case, the large f-
number (small aperture) of the proposed zoom system as observed. from
the screen may produce an image too dim for photo-interpretation use,
even with, transmittance at 50%.
4. The customer has directed. the contractor to do no further
work on this project until directed, to do so.
PLANNED ACTIVITY
5. No further work will be done on this project until the cus-
tomer so instructs.
Declass Review by NGA.
GROUP 1
SECRET EXCLUDED FROM AUTOMATIC DOWNGRADING
AND DECLASSIFICATION
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COMMENTS ON P&DS MEMORANDUM FOR THE RECORD, 6-1343
CONCERNING PAR 233, ZOOM PROJECTION LENS STUDY,
DATED 3 MAY 1966.
I recommend that PAR 233 not be "terminated", but instead be held
active for an indefinite period under a stop-work condition at no cost
tIContract. We would then be in a position to terminate at any
time, but have the additional advantage of being able to continue work
immediately whenever we receive a breakthrough on any of the items
mentioned in the basic memorandum.
is being routed to:
Distribution:
This note and referenced memorandum
following action')
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'SECRET
NPIC/P&DS/D/6-1343
3 May 1966
SUBJECT: Termination of Contract Zoom Projection
Lens Study, wit
FY-1964 funds.
1. Work on PAR 233, an investigation of the feasibility of a
6X to 60X zoom projection lens for monochromatic light, was authorized
on 10 May 1965. The total estimated cost of0 was drawn from
2. In late February 1966, the principal investigator,
tentatively discontinued all work on the project
after encountering several technological barriers. On 4 March 1966,
NPIC/P&DS cabled approval of his decision, pending re-evaluation of
the project.
3. Difficulties have also plagued other projects directly related
to PAR 233. These projects provide potential applications for the
subject zoom projection lens. Their current status is as follows:
a. Spectral region requirements for the ultra-violet, phosphor
projection screen being developed at have not yet
been determined and so cannot be defined for the projection lens.
b. Thel irtual Image Viewer may utilize a zoom
system for monochromatic light, but problems associated with
diffraction grating production have hindered its final
acceptability.
c. A third possible application of PAR 233 was in conjunction
with an image intensifier screen. This area, too, has so far
yielded incomplete results, especially the 0 Polarized study
of the dipole re-orientation technique.
4. Until at least one of the above programs has been successfully
completed, a usable narrow spectral band cannot be defined, and the
problems with PAR 233 cannot be alleviated.
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5. In view of the current technological impasse, P&DS/DB/ISS
recommends that PAR 233 be terminated.
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Development rant , F&M
Distribution:
Orig - Project File (99720-5)
1 - DB Chrono
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SECRET
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