MEETING AT (SANITIZED), ON TELESCOPING LENS BARREL

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78-03172A000200040028-7
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 22, 2016
• Document Release Date: February 21, 2012
• Sequence Number: 28
• Publication Date: August 26, 1955
• Content Type: MEMO

Declassified in Part - Sanitized Copy Approved for Release 2012/02/21 CIA-RDP78-03172A000200040028-7
-SECRET 0
SUBJECT: Meeting at
26 August 1955
, on Telescoping
REFERENCE: Memorandum for C/TSS/TA/PD from AC/TSS/APD dtd
13 July 1955, Subject: Request for Development
of a Telescoping 48* Focal Length Lens
1. Time and Place of Meeting:
on 15 August 1955, from 1100 to 1500-
2. Attendance:
? 3. Purpose: To discuss the development of a telescoping
barrel for a long focal length lens.
25X1
25X1
25X1
4. Discussion:
a. A copy of the specifications attached to the above
referenced memorandum was sent to on about 25X1
13 July 1955. Discussions with personnel of on 25X1
15 August 1955 revealed that they have determined that a satisfactory
48" lens was not readily available. The two lenses which were
found to be optically suitable for the project in question were the
40" Astro, f-6.3 and the 35" Zeiss Apo-Tessar, f-9.0 which have
the following approximate dimensions:
Astro Zeiss Apo-Tessar
Focal Length 40" 35"
f - Number 6.3 9.0
Weight 3-6#(estimated) 12#
Diameter 6-1/4" 7-1/4"
Cost $800 $875
Resolution (lines/mm,
wide open) 85 200
NOTE: The dimensions on the Astro are according to manufacturer
specifications and the Zeiss dimensions are as measured.
b. Zeiss makes an I - " o Tessar lens of unknown
dimensions and currently s attempting to secure 25X1
one of these lenses. These lenses have a nominal sale price of
$1,650, but will not be available for the 15 November deadline
for this project/
c. It was decided,
SECRET
Declassified in Part - Sanitized Copy Approved for Release 2012/02/21 : CIA-RDP78-03172A000200040028-7
 Declassified in Part - Sanitized Copy Approved for Release 2012/02/21 : CIA-RDP78-03172A000200040028-7
0 C0NF1BENTIAL
It was decided, pending discussion with TSS/TA/PD,
that) would secure one of the Astro lenses for
testing and incorporation in_a collapsing lens barrel with the
provision that one of the following alternatives would be selected
to fill the requirement for the other two barrels.
(1) Two additional 40" Astros.
(2) One additional 40" Astro and one Zeiss 35"
Apo Tessar.
(3) Two 35" Zeiss Apo Tessars.
(4) One 4O" Astro or one Zeiss 35" Apo Tessar and one
48" Zeiss Apo Tessar (provided a 48" Zeiss Apo-Tessar is
obtainable and optically suitable).
d. It is estimated that the lens barrel (without lens) will
have an approximate weight of 5-10# (estimated). The housing will be
black anodized and then covered with a flat black baked finish to
achieve a non-reflective black exterior.
e. The barrel is being designed to adapt to either an Exacta
with a bayonet mount or to a Leica with a reflex housing. It is requested
that be supplied with a Leica with reflex housing and 25X1
an Exacta with bayonet mount to facilitate their design of the barrel.
f. In the future, the lens testing will be carried out
according to a standard procedure, the details ofs;which will be
reported to APD. The results will be forwarded by APD to be filed
for any future work with long lenses.
Distribution: ,j
Orig. - AHP #30
1 - TSS/PD
1 - REL
1 - Chrono
TSS/APDJ I (29 aug 55)
CONFIDENTIAL
MW
Declassified in Part - Sanitized Copy Approved for Release 2012/02/21 : CIA-RDP78-03172A000200040028-7