REQUEST FOR DEVELOPMENT OF A TELESCOPING 48" FOCAL LENGTH LENS.

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03172A000200040001-6
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: February 21, 2012
• Sequence Number: 1
• Publication Date: June 28, 1955
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2012/02/21 : CIA-RDP78-03172A000200040001-6
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18 June 1955
MEMORANDUM FOR: AC /TSS /APD
: AC /TSS / TA
Request for Development of a Telescoping
4811 Focal Length Lens.
2. Since the use of a long lens will be frequently required
in areas of difficult accessibility, a telescoping model is felt
to be indicated. The lens tube might be constructed along the
lines of a tripod leg, where small telescoping sections are
utilized. An internal thread might be used to properly fix
each section in rigid position when in operation.
3. For maximum sharpness, use of a process lens such
as the Apo-Tessar is suggested. Although the speed of a
process lens is less than a normal lens, an aperature of
approximately f8 should be sufficient for most work with
modern high speed films. Focusing could be accomplished
by utilizing a helical mount on the lens.
4. Specifications:
a. Lens to be a process lens of f8 or greater,
4811 foca4length, in helical mount (no shutter).
b. Overall length of coin ilete telescoped lens
to be 15".
c. Diameter of tube to be as small as possible.
This will be determined by the diameter of the lens.
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Declassified in Part - Sanitized Copy Approved for Release 2012/02/21 : CIA-RDP78-03172A000200040001-6
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/21 : CIA-RDP78-03172A000200040001-6
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d. Minimum weight.
e. Tube material to be light weight metal of
great strength such as dural or magnesium. Color:
black.
f. Two 5/8" (European type) tripod sockets to
be installed, one at either end of lens tube. Exact
placement to be determined by balance of assembled unit.
g. Camera fitting to be bayonet type, for
Exacta camera.
5. This project has been discussed with of
APD.
6. It is requested that we be furnished with three long
lenses of the above description.
25X1
Distribdution:
2 - Addressee
1 - TSS/SRB
1 - TSS / TA
1 - PD/Files
CONFIDENTIAL
Declassified in Part - Sanitized Copy Approved for Release 2012/02/21 : CIA-RDP78-03172A000200040001-6