DEAR BOB;

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04767A000300050011-0
• Release Decision: RIPPUB
• Original Classification: T
• Document Page Count: 10
• Document Creation Date: December 28, 2016
• Document Release Date: August 29, 2002
• Sequence Number: 11
• Publication Date: March 6, 1968
• Content Type: LETTER

? Approved F r Release 200
DECLASS REVIEW by NIMA/DOD
Dear Bob:
We have made the practical test suggested by
a number of filter combinations.
25X1A
using
Unfortunately, it looks as if two filters above 500 m? cannot
be used because the differences in spectral reflectance are not great
enough to discriminate with broad-band filters.
Nevertheless, it does lock like the combination of a 47B+2E,
used with either a 21 or a 25, w:i-I give good discrimination, even including
the effects of the atmosphere. The spectral model indicates that, for
the haze which most frequently occurs, and the two records given an
exposure such that high reflectance neutrals will be equal in density,
the LogE separation between the 1:7 b-2E and 21 filter combination will
still be about .15 units (a densit,i difference of about .4).
The effect of varying degrees of haze will be less than we had
originally expected, since the spectral reflectance of the uranyl nitrate
in crystalline form is apparently higher below 500 mg than the absorption
spectra we looked at originally,. I am enclosing the spectral reflectance
values for the crystal sample we measured..
The filter factor for the 2E+47B combination is.in excess of 10.
However, practical tests indicate a factor of 8 is adequate to allow first-
class data reduction. The exposure scale is so compressed that even a
little less exposure would probably be possible. We will examine this
problem a little more closely.
I am sending this information to
at your request.
Should you have further questions, please contact me.
JSA:atr
Encl.
25X1A
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Attachment 1 to
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 ILLEGIB
L Approved For Release 2002/09/03 : CIA-RDP78BO4767A000300050011-0
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Approf c6 FWI6A X3'002/09/03: CIA-RDP78B04767A000300050011-0
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25X1A
CURRENT PLANS FOR SYSTEMS CAPABILITY EFFORT
6 MARCH 1968
Approved For Release $I9j~3 : CIA-RDP78B04767Ad00300050011-0 25X1
 - Approved For ReI se 2002/09/03 : CIA-RDP78BO4767A000300050011-0
SECREJ
25X1
FLIGHT
TEST
DESCRIPTION
FILTER EXPOSURE
21, 23A, 25
1-1/3 STOP RANGE; DENSITY
COMPARISON
BISPECTRAL
POLARIZER
W/25 + SF-05
POLOCOAT, 20? ANGLE
SO-230
BISPECTRAL
WIDE BAND FILTER
"FASTER" 3404 TYPE FILM
W/25 + SF-05, OPERATIONAL
WRATTEN NO
12
SO-380
a
ULTRA THIN BASE FILM
SO-180
#
COLOR INFRARED FILM
SO-340
NIGHT (TRI-X EMULSION)
CR-5 S0-121
CR-6 POLARIZER
CR-8* ' THROUGH FOCUS
TENTATIVE
COLOR
WINTER, PROPER AXIMUTH
STEPPED GLASS FILTER
*3400 SUN LINE TEST MAY BE SUBSTITUTED,
CR-8 SCHEDULED AHEAD OF CR-7
SECREJ
25X1
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 Approved For Ree 2002/09/03 : CIA-RDP78B04767A 00300050011-0
? SECREJ
25X1
1. FILTER EVALUATION
o BASIC OBJECTIVE: SEE WHAT DIFFERENCES OCCUR. IN
OPERATIONAL PHOTOGRAPHY WITH THE
WRATTEN NO. 12, 21, 23A, AND 25. FILTERS
A. SUBJECTIVE EVALUATION
B. MTF ANALYSIS OF IMAGE QUALITY
C. TRADEOFF BETWEEN EXPOSURE TIME AND ATMOSPHERICS
2. EXPOSURE ANALYSIS
BASIC OBJECTIVE: DETERMINE:
1. IF SLIT CHANGED PROPERLY
2. IF WE EXPOSE PROPERLY
3. COMPARISON BETWEEN TARGETS
AND TERRAIN DENSITIES
A. SUBJECTIVE EVALUATION
B. DENSITY VERSUS FREQUENCY ANALYSIS
C. EXPOSURE ANALYSIS WITH HIGH PRIORITY TARGETS
D. COMPARISON OF TARGETS AND TERRAIN DENSITIES
3. BISPECTRAL PHOTOGRAPHY
BASIC OBJECTIVE: TEST THE OPERATIONAL FEASIBILITY OF
OBTAINING BISPECTRAL PHOTOGRAPHY
FROM MISSION PHOTOGRAPHY
A. SUBJECTIVE ANALYSIS OF TARGETS WITH RESPECT TO
TONAL DIFFERENCES, (NPIC) .
B. OBTAIN GOOD BISPECTRAL PRINTS
C. IMAGE QUALITY ANALYSIS OF SF-05 IMAGERY
D. TEST BEST METHOD OF OBTAINING BISPECTRAL IMAGES
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4. POLARIZER FILTER
? BASIC OBJECTIVE: DETERMINE THE EFFECTIVENESS OF A
POLARIZER AS A HAZE-CUTTING FILTER
A. IMAGE QUALITY ANALYSIS
B. ATMOSPHERIC EFFECTS AS A FUNCTION OF SOLAR
ALTITUDE AND AZIMUTH
C. DETERMINE EFFECTIVE FILTER FACTOR
D. SUBJECTIVE ANALYSIS OF TONAL RENDITION
5. SO-230
v BASIC OBJECTIVE: COMPARE SO-230 WITH 3404 IN AN
OPERATIONAL MISSION
A. FILM SENSITOMETRIC CHARACTERISTICS (FOG, GAMMA,
SPEED, FILTER FACTORS)
B. FILM IMAGE QUALITY ANALYSIS (MTF, RESOLUTION)
C. SUBJECTIVE EVALUATION OF FLIGHT FILM
D. SYSTEM RESOLUTION
E. TONE REPRODUCTION COMPARISON
6. SO-380
o BASIC OBJECTIVE: TEST SO-380 IN THE SYSTEM
A. !;'::M SENSITOMETRIC CHARACTERISTICS (FOG, GAMMA,
SPEED, FILTER FACTORS)
B. FILM IMAGE QUALITY ANALYSIS (MTF) RESOLUTION)
C. SUBJECTIVE EVALUATION OF FLIGHT FILM
D. SYSTEM RESOLUTION (MTF/AIM)
E. LAB CHAMBER TESTS
F. LIMITED DIMENSIONAL STABILITY ANALYSIS
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SECREJ
7. SO-180
o BASIC OBJECTIVE: OBTAIN MISSION PHOTOGRAPHY WITH
CAMOUFLAGE COLOR FILM
A. SUBJECTIVE ANALYSIS OF INFORMATION CONTENT
B. TONE REPRODUCTION ANALYSIS
C. RELATIVE IMAGE QUALITY (RESOLUTION,
MICRO PHOTOGRAPHS)
8. NIGHT PHOTOGRAPHY
o BASIC OBJECTIVE: DETERMINE IF ACTIVITY CAN BE
DETECTED AT NIGHT
A. SUBJECTIVE ANALYSIS
B. STATIC ANALYSIS
C. THEORETICAL ANALYSIS OF NIGHT DETECTION
CAPABILITY
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