EVALUATION OF(Sanitized) REAR PROJECTION VIEWER PROPOSAL

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A001900020011-9
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 8
• Document Creation Date: December 28, 2016
• Document Release Date: February 23, 2005
• Sequence Number: 11
• Publication Date: May 6, 1966
• Content Type: MF

Approved For Rise 2005/05/02: CIA-RDP78B04770Aq 1900020011
IPO/OSB%M-143-66
6 May 1966
MEMORANDUM FOR: Assistant for Plans and Development, NPIC
SUBJECT Evaluation o ear Projection Viewer
Proposal
1. The following comments are forwarded for your review. Pages and
paragraphs have been listed for referral to the proposal text and are as
follows:
Page 3-3 Para 2 - Is there an auxiliary set of controls available
for this operation?
Para 4 - Would request that the service light be on when
loading film also.
Para 6 - Request cover panel on base also to prevent any oil
or water collecting on floor.
Para 7 - Sentence 3 - It would be better designed if the
screen were to remain stationary. Sufficient room, it seems, is available
for film loading without moving the screen, Cant of the screen could result
from this arrangement.
Para 8 & 9 Page 3-5 - Pneumatic mounts? How are they in-
flated? Life expectancy? Although separate module may be desired for
electric circuits and cooling mechanisms, present viewers
enclose
25X1
these in a compact housing. Would it be possible to design an individual
module that could be included in, but separate from, the cabinet design?
This should not radically alter the structural rigidity of the unit.
Over-
all dimemsions of this viewer are comparable to
Viewers.
25X1
Page 3-6 Can changeover time be made in less than five (5) seconds?
Would prefer 8-10 l/mm at 70X and other magnifications not rated at
10 1/mm. Would prefer a slight forward tilt and viewing screen, first to
help reduce glare and secondly to present the image in a plane that is more
perpendicular to the individual's line of vision.
Page 3-11 Alinement of moving lens element is critical when magni-
fication of image is changed. Instead of a footage counter as contemplated,
it would be more advantageous if there could be a reticule and mm counter
with zero reset incorporated for X & Y coordinate measurements of imagery.
Accuracy of counter should be + 0.5 mm over 40 inches or better.
Approved For Release 2005/05/02: CIA-RDP78B04770A1A40 O'1q\&9by NGA.
 Approved For Ruse 2005/05/02: CIA-RDP78B04770AQ,;1900020011-9
IPO/OSB/M-143-66
6 May 1966
Page 2
Page 3-13 It is best that the reel sensor arm also be removed since this
is a cause of film scratching. Motors for film drive are available to main-
tain slew under varying load conditions.
Page 3-14 & 15 Experience with knob and "toggle" switch focus adjustments
has resulted in the preference of "toggle" (joystick) operation. Immediate,
positive response to a small deflection of the toggle is required especially
at high magnification. End of reel indicator not necessary.
Page 4-4 & 5 Looks like there is a great deal of I R radiation (7000A0)
that will present a problem of heat dissapation. If I have incorrectly
interpreted the graph, let me know. How is "radiator" referred to on
Page 3-9 this effective? Can you produce 20 ft/L thru 1.5 ND film at screen
under these conditions?
Page 4-7 It is hoped that no dark "rings" appear on the screen as
result of the "Mosiac Rack".
Page 4-8 There are cold mirrors and filters to eliminate IR. Please
clarify page 4-4 & 5.
Page 4-17 LS-60 at this time seems to be a wise choice. May change
our opinion however by the time you receive comments.
Page 4-21 Sandwiching film between two pieces of glass at various
clearances has not to date solved focus problems. Edge guiding has proven
its ability to keep film flat on platen, also it is not supposed to contribute
to film scratching to any extent - at least not in the image area. Submit
that this approach be investigated. Two lI viewers and one have proved
this.
Page 4-22 2% of what?
Page 4-26 We'll settle for separate magnification control.
Page 4-29 If the drive speed is scaled to the magnification, how can
the rate or apparent motion of image be independent of magnification? It
this means what I think it does, it isn't necessary. Scan speed should be
determined by deflection of joystick. Don't agree with reel diameter sensor
concept.
Page 4-33 Suggest strongly that there be a clockwise and counter-clock-
wise switch on the film drive motors to accomodate film wound emulsion up or
emulsion down.
26x1
Approved For Release 2005/05/02 : CIA-RDP78BO477OA001900020011-9
 Approved For Release 2005/05/02 : CIA-RDP78BO477OA001900020011-9
IPO/OSB/M-1L3-66
6 May 1966
Page 3
Subject: Evaluation of
Rear Projection Viewer Proposal
Page 4-35 Same comments as before. 2 glass plates will not provide for
flattening film required for high magnification. Edge holddown techniques
have proven to be better. Are glass flats "readily" or "easily" removable
(without tools, etc.)?
Page 4-37 What does the r-f pulse do to other equipment in the
immediate area? Is this shielded to prevent transmittal of signal (pulse)
to other equipment?
Page 6-3 Item C - Add - Upon approval, customer will retain engineering
drawings or an acceptable copy thereof.
B. Spare Parts
For the first instrument only there should be in-
cluded the operating spare parts for a 6-months period
as listed under the next topic (C-Documentation, item 3).
2. The Photographic Analysis Group is of the opinion that coordination
of this project has been well implimented and we will support it to the
fullest extent possible. Although at present, there seems to be a lag in the
use of rear projection viewers that is no criterion to apply to possible
operational procedures in the near future. Your cooperation is appreciated
and if we can be of further assistance please contact
Assis or Photographic Analysis, NPIC
Distribution:
Orig & 1 - Addressee
1
1 - Asst Pa
1 - IPO/OSB/PAG
Approved For Release 2005/05/02 : CIA-RDP78BO477OA001900020011-9
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Approved For Release 2005/05/02 : CIA-RDP78BO477OA001900020011-9
 Approved For Release 2005/05/02 : CIA-RDP78BO477OA001900020011-9
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Approved For Release 2005/05/02 : CIA-RDP78BO477OA001900020011-9
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