STAFF STUDY -(Sanitized)ZOOM MAGNIFIER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A000300050002-2
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: March 26, 2001
• Sequence Number: 2
• Publication Date: February 19, 1964
• Content Type: MF

' Approved For Release 2001/04O ' UTO127iaB047 4000300050002-2
19 February 1964
MEMORANDUM FOR: Chairman, Technical Development Committee
THROUGH . Executive Secretary, TDC
SUBJECT . Staff Study - Zoom Magnifier 25X1A
To improve the performance of the Photo Interpreter's Tube Magnifier for use
on small scale imagery.
II. FACTS:
A. The most used item of PI equipment in NPIC is the 7X tube magnifier;
however, the instrument is inadequate for the exploitation of the small scale
imagery obtained from current operational systems; in addition, this is also
true for images on the outermost portions of the B configuration obliques.
B. The use of a higher power tube magnifier presents its own problem since
as the power increases, the field of view decreases; furthermore, the working
distance of the magnifier decreases to the point that the instrument can not
be comfortably used. The present limit for a. reasonably comfortable magnifier
is approximately 12X.
C. It is apparent that no fixed magnification instrument can provide the
proper compromise between optimum magnification and optimum field. of view;
consequently, a continuously variable (Zoom) tube magnifier is required.
D. This proposal is in response to a request from P&DS and is based upon
.,r a company funded feasibility study and preliminary design.
25X1A E,
ing parameters:
preliminary design indicates they can meet the follow-
1. Magnification range of approximately 8X to 18X.
2. Satisfactory aberration correction.
3. Light weight (4 to 7 ounces).
4. Maximum height of 86mm. (3.38").
5. Minimum height of 80mm. (3.15").
6. Field size, 15mm at 8X and 4.44mm at 18X.
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Approved For Release 2001/04/02 : CIA-RDP78B04747A000300050002-2
 Approved For Release 2001/04~Q2S6T,~-UOR78B0474?000300050002-2
25X1 A SUBJECT- Staff Study - Zoom Magnifier
7. Working distance approximately 15mm.
8, Erect image.
25X1 A F.
1. The scales would be compatible with their (7X Measuring Magnifier
Scales).
2, The stand would be the same (clear plastic tube) used in the 7X
Magnifier.
G. The Zoom system is composed of three (3) doublets with two (2) of the
doublets being positioned by a, spiral cam and activated by rotation of an
err. external ring or sleeve.
H. A Manual of Operation will be provided.
25X1A
25X1A I. has proposed to design and fabricate a prototype under
a 10 month CPFF contract at a total estimated cost and fixed fee of
III. CONCLUSIONS:
A. The development of a. small, (hand-sized), light weight, Zoom tube
magnifier would provide the PI with a. highly versatile uncomplicated tool to
aid in the exploitation of current and future small scale photography.
B. A zoom tube magnifier would permit each individual PI to pick that one
combination of magnification and field of view which is optimum for the par-
ticula.r imagery being studied..
C. Photo Interpreters vary considerably in their personal preferences as
to what magnification power they would prefer. This approach would permit one
instrument to replace two (2) or more other magnifiers.
25X1A D. quoted figure of_CPFF appears reasonab25X$A
respect to the formidable optical design problem involved; however, it would
appear to be to NPIC's and the Government's advantage to negotiate this contract
CPIF. This could result in a. slightly higher initial contract cost but should
result in overall savings by minimizing the possibility of overruns,
25X1A
That NPIC sponsor and P&DS monitor a - CPIF contract for up to but not
25X1A exceeding for the design and fabrication of a prototype Zoom Magnifier.
25X1A
SECRET
Development Branch, P&DS
Approved For Release 2001/04/02 : CIA-RDP78B04747A000300050002-2