(Sanitized)'VISION COMPARASCOPE'

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B05171A000200020251-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 1
• Document Creation Date: December 28, 2016
• Document Release Date: February 18, 2004
• Sequence Number: 251
• Publication Date: January 6, 1970
• Content Type: MF

Approved For Release 2004/ A=RDP78B05171AOQ,q,200020251-8
F011. Director, 'National- Photographic Inte?px eti~tion Center
""Vision Mmpa`a#e"
your c it request, the attar ea data sheet was
se t
o
re
n
wined aria t ie su'bj ect instrument was examined at by one or our
11::1m12.Ut>~t msni.ters 'on 15 December 1969. It is a Wh-
but by 7and primarily intended for circa oar sembly
distlr"I
onstrator considered it outstanding in the
he d
er~
Pi u h t
ections.
y_ ` ica3 eirecteristics were quite crude compared to PI equip-
1rLl +4 __ 1v _-A 4A,- $cl nn method for adjusting
he Dasic vlewsix6 n,vua + ... -
alfication feature is poorly engineered and the
l
'
m
ecna
laprovidethat,
x+a ore ogized for it. However, the Comparascope
- - e of "flicker viewing,
gr cl a.n to a sere a
soon e acquiring with the Image Comparison Microstereoscops
. The 6bmparascee technique employs rotating polarizing filters,
~,tipu h the d,oristrator could not explain the details and no drawings
imeiatey aieiiable. The ICM technique involves electrical
alternation .o fie light sourdes.
The mechanl.l. "flicker" method was ` e,5ectea during the design
because of concern for vibration
velopment
d
,
e
itiy phase OT TIM
~i viewing high resolution imagery under high magnification. Never-
affirms our belief in
re
..
scope
ue fu ness 0! the "flicker" technique for comparison viewing. We
1*0 i"6r'wa to of this feature after projected delivery of the 1CM
,i`il ` l9?C.
~, perasce "beta Sheet
4 hution
Declass Review by NIMA/DQD
.. . ' Adireseee w/att
.~ iC/'TSSG/RID
~jTSSC3/RED/SRS
T 6 Jan 70~
NPIC/TSSG/RED/SRB
aief, Technical ServiIces & support Group, 1 C
25X1
25X1
GROUP I
Exctnded from automatic
Approved For Release 2004/03/ 78B05171A000200020251-8 downgrading and
declassification