TEST AND EVALUATION REPORT WIDE FIELD HIGH POWER ANAMORPHIC STEROVIEWER DATED MAY 1974

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04560A007400010024-8
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• Original Classification: U
• Document Page Count: 14
• Document Creation Date: December 28, 2016
• Document Release Date: May 11, 2012
• Sequence Number: 24
• Content Type: MF

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MEMORANDUM FOR: Recipients of Technical Publication R-16~1+
SUBJECT Test and Evaluation Report
Wide Field High Pawer Anamorphic Stereoviewer
Dated May 1971+
Please change the assigned report numbex to NPIC~R-1771+,
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TEG~I#CA#.
PULL#C,ATION
NATIONAL PHOTOGRAPHIC
INTERPRETATION CENTER.
TEST AND EVALUATION REPORT
WIDE FIELD HIGH POWER ANAMORPHIC STEREOVIEUVER
,,
.~
~~ic~~-~~~~~
1~I1~1Y 1974
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FOR OFFICIAL USE ONLY ~zc/~-1~/7~-
TECHNICAL PUBLICATION
TEST AND EVALUATION REPORT
UUIDE FIELD HIGH PODUER
A111AI~ORPHIC STEREOVIEWER
MAY 1974
NATIONAL PHOTOGRAPHIC INTERPRETATION CENTER
F~e~~erse side 6lanh
F(lR (lT;'i~ 7(''Te T T Tc~ lIT~.TY v
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STAT
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1. INTRODUCTION
Z. SUMMARY OF TEST RESULTS
3. CONCLUSIONS
Distribution
Figure 1. Wide Field High Potver Anamorphic
Stereoviewer
Figure 2. WFHPAS Operator Controls
Page
FOR OFFICIAL USE ONLY
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Figure 1. Wide Field High Power Anamorphic Stereoviewer
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F'UR UFFiC;iAL U~'fJ UiVLY ivriv~n-iy~ ~~
WIDE FIELD HIGH POWER ANAMORPHIC STEREOVIEWER
1. INTRODUCTION
The Wide Field High Power Anamorphic Stereoviewer (WFHPAS)
is a prototype instrument to be used for the analysis of high
" resolution photography at high magnifications and yet have an
extremely wide field so the operator may examine the subject
in context with its surroundings..
1
It has continuously variable magnification from 1OX to
180X, anamorphic magnification from 1X to 2X, 360? image rota-
tion,--and 40 stage rotation. Main features, aside from the
high resolution and high magnification, are the extremely flat
field optics, 72? angular field of view, common zoom, and com-
mon stage motion.
The WFHPAS was delivered to NPIC on 26 April 1973. This
report summarizes findings from acceptance testing, engineering
testin and o erational evaluations, including those conducted
STATINTL by and several photointerpreters representing
TAS, IEG, DIA, and SPAD.
The WFHPAS is shown in Figures 1 and 2.
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Figure 2. WFHPAS Operator Controls
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2. SU~~i~?IARY OF TEST RESULTS
Operational Test Results
The following statements are summarized from
,
studies made on the WFHPAS (DK-1048 -.The Effect of Display
Field Size on Interpreter Performance):
The optimum angular field of view for search
tasks is 36?. Angular field of the WFhPAS is
72?.
For order of battle readout, the optimum angular
field is 54?. No further improvement is gained
by the 72 ? field of the WF,~IPAS .
P1ote: In this report (DID,-1048) ~~did not attempt
to evaluate the effectiveness. of zrie-tide fields in
interpretation of objects in context with their sur-
roundings. The degree of effectiveness was evaluated
by several photointerpreters over several months use
of the WFHPAS.
The following comments are summarized from both i~~ritten
and verbal reports received from photointerpreters:
Twenty of 26 PIs (IEG) surveyed perform search
tasks regularly. The remaining six do detailed study
regularly. Only one of these six said that the ride
field (72?) gave continuity to his task. The other
five made only very general statements as "it helps'.' or
"it gives good Quality viewing over a wide. area."
Of the 20 who perform search tasks regularly, 11
.stated some very generalized benefit with the wide field
of view. One PI believed that the wide field was not
generally needed for detailed study.
Comments about the main features:
A4agnification Range - Sufficient or more than enough.
Light Intensity - Enough to Questionable i~~ith very
dense imagery.
Common Stage Motion - Useful (by most) to marginal bene-
fit.
STAT
STAT
3
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mutt ur r t~tHL u a~ UIyL ~ -- - , -
Anamorphic
Magnification
Film Stages
(Loading)
- Six believed it useful,-three others
not useful.
- Considered by most as worst
feature .
The summary of comments from .technical. representatives of
IAS, DIA, and SPAD was that the WFHPAS is very nice but not
cost effective.
Test Results
The following tabulation summarizes results of accept-
ance and engineering tests.
Magnification - lOX to 180X (within So).
Field of View - 370 mm divided by total magnifica-
tion (2.06 mm at 180X).
Image Quality - No bothersome distortion, field
(Compared to Twin curvature, lateral or longitudinal
Dynazoom) color. In actual viewing tests,
the image c{uality is not statis-
-? tically different than that. of the
Twin Dynazaom (DK-1049).
On-Axis Resolution Magnification
(High Contrast - (X)
Both optical paths 80
-are essentially of 95
the same resolution) 50
20
10
Line Pairs/mm
S ecified Measured
1 ~-
758 722
450 400
195 200
100 102
Off-Axis Resolution - 180
915
850
(High Contrast,
at
95
650
635
8 FOV)
50
382
360
.
20
165
115
10
82
60
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x~Utt Ur'r'iC;lAL U~~; UNLY
NPIC/R-16/x(4
Off-Axis Resolution -
180
700
650
(High Contxast, edge
95
490
400
of FOV)
76
410
320
72
400
330
Note: All readings above are the- median value of three
observations. On-axis readings at lOX and 20X were made
using a 3X Diopter Telescope.
Anamorphic NTagnification - 1X to 2X (Measured), 1X to
2.ZX (Specified).
Interpupillary Distance - 55 t~ 78 mm, 80 mm is the
(Range) specified maximum.
Eye Relief - 15 mm.
Illumination Intensity - 12,000 foot Lamberts at lOX to
1,300 foot Lamberts at 180X.
Was adequate to determine step
separations on wedge up to
3.0 density.
Colar Temperature - 3200 K, (2950 K was specified).
(Through Optics)
Convergence Angle - 3? (1-1/2? per optical path).
(Accommodative Distance) This corresponds to an accom-
~-' modative range, with IPD
variation of 76 mm to 55 mm,
of from -.7 diopters (1.45
meters) to -1.0 diopters (I.0
meters) .
Note: Although the fields of view converge to 3?, the
usefulness to the observer is very doubtful. The reason
is that the fields are so large that the edges of the
fields are not seen when vietiring toward the center. There-
fore, the observer has no guide to determine the conver-
gence of his or her eyes. For an instrument with smaller
fields, as the Twin Dynazoom (40? angular fields), the
fields do determine the convergence angle of the observer's
eyes i? =the fields of vieta are superimposed.
FUII, OFFICIAL USIA UNLY ,
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Common Stage Motion - Provided by clutch coupling the
x-y motions of both stages.
Failed to work properly during
2 months use.
Image Rotation - 360? for each path. At set-
tings above 5 to 10 ? the prisms
cause the stereo image to pull
apart as the zoom is changed.
Common and Independent
Zoom - Clutch couples the independen t
zooms. Zoom remains in good
focus over its range.
Heat (Light Sources) - No damage noted to 3.0 density-
film.
Stage Platens - Keeps film within depth of
focus of the 180X objectives.
Objective Focus - Objectives-are very parfocal.
Coarse focus is adeQuate for
all objectives. Fine focus
control is not needed.
Electrical Safety - Leakage current is less than
(Leakage Current) .07 ma. (American Standard
for Appliances is .5 ma.)
Size and Weight - ZVidth - 42 inches, Depth - 27-1/Z
inches, Height - 17-1/2 inches,
Weight - 260 pounds.
Control Location - Controls are properly located
Operation and labeled. Most difficult
to use is the top glass platen.
Fine focus control is not neces-
nary. Anamorphic magnification
and rotation controls are con-
sidered not as well placed as
those on the Image Comparisor_
~Iicrostereoscope (IC1I) .
Reliability - Instrument is essentially
Maintainability maintenance free. Lubrication
of moving parts is either not
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Construction
needed or is permanent. Lamp
replacement has not been needed
to date. Mast optical surfaces
can be cleaned; however, they
are not easily reached.
- The WFHPAS is well designed.
Rigid mounting of optics pre-
vents bothersome image vibra-
tion noted in some other micro-
scopes.
Mechanical Failures - Certain minor failuxes were
noted. Common stage motion
clutch slips and drags. Glass
platens come unglued (repeatedly)
from rear hinge. (This problem
was fixed in-house by the
Equipment Performance Branch.)
Fine focus drive belt. slipped
off the sprockets.
Operator and Maintenance - Clearly written and complete
Manual for routine needs.
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3, CONCLUSIONS
Although the WFHPAS met the major contractual specifics-
tions, the following additional factors should be considered
in arriving at a decision to purchase a production version.
? Of the six IEG PIs who regularly perform detailed
one believed the WFHPAS gave continut
, onl
stud
y
y
to his task.. None of the six stated that mare In or-
mation could be gotten from the film by viewing through
?
field (Twin
the 72? field of view as opposed to a 40
Dynazoom).
? None of the PIs from IAS, SHAD, or from DIA reported
any benefit of viewing with the 7Z? field of view.
? Present film quality can be resolved equally well with
t e Twln Dynazoom.
? Technical representatives-from IEG believe the anamor-
phic magnification capability is of questionable value.
This is because the resolution of the imagery generally.
is poor at points where anamorphic correction is needed.
? The 15X wide field eyepieces (59?) will soon be
available. These eyepieces, which are being made
especially for the Zoom 240, can also be used in the
BBL Twin Dynazoom. This increases the angular field
__ of the Dynazoom from 40 to 59?. Field curvature ~~~ith
the 15X eyepieces is slightly worsened,-but it is con-
sidered useable. This means that the Twin Dynazoom
may meet most needs for a wide field of view, high
magnification, and high resolution.
? Cost per production copy, although not firmly quoted,
would probably be high for a small number of copies.
i~~ost people who evaluated the WFHPAS believed the
instrument not to be cost effective.
Certain minor mechanical deficiencies are considered easily
correctable. These include the common stage motion clutch,
which slips, and the glass platens, w'nich come unglued from
the hinges.
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