(Sanitized) REAR PROJECTION VIEWER ATTACHMENT FOR THE ZOOM 240 SYSTEM

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04560A007200010034-2
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 18
• Document Creation Date: December 28, 2016
• Document Release Date: April 12, 2002
• Sequence Number: 34
• Publication Date: May 1, 1973
• Content Type: REPORT

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TECHNICAL
PUBLICATION
NATIONAL PHOTOGRAPHIC
INTERPRETATION CENTER
TEST AND EVALUATION REPORT
25X1
REAR PROJECTION VIEWER ATTACHMENT
FOR THE ZOOM 240 SYSTEM
CONFIDENTIAL
NPIC/R-12/73
MAY 1973
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WARNING
This document contains information affecting
the national defense of the United States.
within the meaning of Title 18, sections
793 and 794, of the U.S. Code, as amended.
Its transmission or revelation of its contents
to or receipt by an unauthorized person is
prohibited by law.
CLASSIFIED BY: 013170
Exempt from General Declassification Schedule
of E.O. 11652, Exemption Category: 5B(2)
AUTOMATICALLY DECLASSIFIED ON
DATE/ AM4 ftnRmlem 200
 )P.EMAIe1 NPIC/R-12/73
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TECHNICAL PUBLICATION
TEST AND EVALUATION REPORT
REAR PROJECTION VIEWER ATTACHMENT
FOR THE ZOOM 240 SYSTEM
Comments and. queries regardin this re ort are welcomed,
They may be directed to
NPIC/TSG/ESll/I'E13, Code 143,1
NATIONAL PHOTOGRAPHIC INTERPRETATION CENTER
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A CT
INTRODUCTION
A. SUMMARY OF Ti S'I RLSUITN
Acceptance Tests
Engineering Evaluation
Operational Evaluation
i:c)NI;LU: IONS AND RLLOMMPNDA I TON
DESCRIPTION OF EQUIPMENT
TEST DETAILS
5.1 Acceptance Tests
5 . 2 Engineering Evaluation
5.3 Operational Ivnluations
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The Rear Projection Viewer (RPV) was tested and evaluated
at NPIC between October 1972 and March 1973. Acceptance tests,
engineering evaluation, and operational evaluations were con-
ducted within this time period.
This prototype RPV is well constructed, both mechanically
and optically. The single instance in which the RPV did not
meet the contractual specification did not appear to hamper
the PIs in their evaluation of the RPV concept. This concept
of monoscopi.c viewing on the RPV's rear projection screen was
generally considered not useful.
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0
REAR PROJECT ION VIEWER ATTACHMENT
FOR TIIE ZOOM 240 SYSTEM
The "Rear Projection Viewer, Fig. 1, is an attachment
for the Zoom 240 Microstereoscope system. It was received. by
the Test and Evaluation Branch, ESD/TSG, on 26 October 1972.
This completed the delivery of hardware on the Research and
Engineering Division's Zoom 240 Improvements contract with
Acceptance testing of the previously delivered iI 25X1
Rhomboid Viewing Ports was reported in NPIC/TSG/ESD/TEB 6/
72 dated 20 October 1972.
The Rear Projection Viewer is an experimental device
intended only to enable evaluation of the concept of monoscopic
scanning with'a rear projection screen device on a light table.
The RPV can be attached to the monoscopic portion of the dove-
tail slide on a Zoom 240 Microstereoscope system. The RPV
requires the high intensity of 15,000 to 25,000 fL which is
presently available only from the High Intensity Tracking Light
Source (IIITLS) light table.
In use, the RPV optics bypasses the Zoom 240 optics and
provides 3.8X magnification on a 4.1-inch diameter roar projec-
tion screen. Its projection lens is movable to permit normal
monoscopic viewing through the Zoom 240. The RPV mounting
bracket has a machined recess to hold a neutral density filter
in the light path to the Zoom 240 to reduce the 25,000 fL of
the IIITLS by a factor of 100 for operator safety and comfort.
This report contains acceptance test results, engineering
evaluation results, and operational. evaluation comments by two
of the operating components of
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\cccptante. tests
c The RPV prototype cash . rc: of as lb 1'itie pairs/mm
CV) lho entire 4.1 inch diameter >. re n.
ce The RPV prototype provides a c rrectly oriented image
Ni n mapni_fication OF 3..Sk..
f rori th.c Zoom 240 `licro.;tereoscupc
M prototype.
vs in to
o The Zoom 11H cat Ii)' com I ortan ? tie Zoom 240 when the RIP prntotvpc is mounted.
o the RPV prototype' has no provi son for image rotartton
lo n4iust Iur oh11goity and/or -un a ng -.
0 I'hc REP profotyl)Y is very w,t i :onstructed, both
rncch:inir:r11v and opt ica.;y.
orra.l 1 vaiua 0ri
o .I'he 1ZPV rcplaire more i luiii,rrai on than is presently
expected to be avaiahte to Pis i_ NPIC.
s , 40S P evaluators _see no V a l c_rk i the conCop t O F rriono-
up;c s-anning with the k PV.
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3.1 The RPV met all of the contractual requirements except
for the center-to-edge brightness gradient and was judged
quite adequate as an experimental device to test a concept.
3.2 The operational evaluation showed only a very mild interest
in the concept of monoscopic scanning of film with this rear
projection screen. Most participating PIs did not find it
beneficial for the tasks they perform.
3.3 The results of the engineering evaluation are that the
construction, both mechanical and optical, is quite adequate;
that the RPV, when focused, does not clear the old or new film
holddown devices: that the 2X stereo lens objectives cannot be
used without removing the RPV: and. that the screen brightness
and contrast is adequate on the f[ITLS except for low contrast,
high density imagery.
3.4 It is recommended that no further implementation of this
concept be pursued.
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4. DESCRIPTION OF EQUIPMENT
The RPV prototype, Fig. 1, features a 4.1-inch diameter
rear projection screen. A 3-inch focal length Super Baltar lens
and roof prism are mounted on a mechanical slide in the RPV.
In the extended position, the roof prism intercepts the light
rays that would go to the Zoom 240 in the monoscopic mode.
The Super Baltar lens projects the image onto the screen at
3.8X magnification with 16 line pairs/mm resolution or bettor.
A light table providing about 25,000 fL is required. When the
slide is in the retracted position, the light rays pass to the
Zoom 240, impeded only by whatever filter may be in the filter
holder of the RPV. Figure 2 shows the mechanical slide in the
extended position, the filter holder cutout in the shelf above
the slide, and the 2.5 and 2.0 d.u. neutral density attenuating
filters lying to one side of the RPV.
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.1 cceptance Tests
Upti cal ltesolut:i on
The RPM- shall he capable or resoling 16 Irons per mill
meter at the film plane.
lost Method. -- The It['I'i $ light tab was set at 25,000 Fl .
Il-[n[ 1951 pattern resolution targets o""igh, medium, and low
contrast and of both polarities were s ecess i vo l v placed on
the I iaht table.
Conclusion. - The PPP easi l v meets the requirement over
the entire screen. The resolut i nn was L6 line pairs/mm or
het lor.
Brightness Gradient
The maximum linear hr i ghtness Pra; i ent shall not exceed
25 percent between any two measurement on the screen.
lest; Method - The brightness mcasi cements were made with
the CM-13 microscope head and the Unit, J Detector Technology
Model llll photometer (S/h 50016). The FTTTI,S was scanned to
optimize each light reading.
rest Results
Polative
I glit
road i ngs
and
percent
Call ff
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Conclusion - The RPV does not meet the requirement.
Optical Magnification
The magnification is listed as 4X.
Test Result - The magnification is 3.8X.
Conclusion - The RPV meets the requirement of a nominal
4X magnification.
Rear Projection Screen Diameter
The screen diameter is listed. as 4 inches.
Test Result - The diameter is 4.1 inches.
Conclusion - The RPV meets the requirement of a nominal
4- inch screendiameter.
Image Orientation
The RPV shall be constructed so as to provide an "erect"
image, by which it is meant that the image appears as it
would if the light table were tilted into the plane of the
screen.
Conclusion - The RPV meets this requirement.
Mechanical Features
The RPV will slip over the edges of the Zoom 240 dovetail
slide and be held on with a compression screw.
The RPV objective lens will be movable to permit viewing
of the image through the Zoom 240 in mono with no add-on objec-
tives.
The stereo rhomboid arms should. not have to be removed
from the Zoom 240 to use the RPV.
Conclusion - The RPV fulfills all three of these require-
ments.
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Provi s ion willbe made for an ttt, nuatInc filter to be
i.ised to protect the operator's eyes fr )m the intense light
'M rce (25,000 fl, from the 1Il'C1.`>) when viewinh the in)a_gc
I I I no!tgh the Zoom 240.
Test Result - 'Iwo neutr.aI dens ty fi [tors were provided
o1" 2.0 and "'.5 density units. [he Rd" fitting that clamps
onto the dovetail of the Zoom 240 has machined recess to
hold either neutral dens Dv filter n he optical path of the
1.eO,m 240 in the mono scop i c viewing mod . It was oh-served that
[lie 2 . 0 density un=it fi ter was suf --i c ,ant to reduce the 1 i ght
i life isity through the loom 240 evep T ec s to the level seen on
t he screen of the I:PV.
(:oneltts ion - I'he R.Pb e asi I v meets this requirement.
I ,ogincering 1val_u