LETTER (SANITIZED)

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP79B00873A000800020036-6
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 8
• Document Creation Date: December 28, 2016
• Document Release Date: October 16, 2012
• Sequence Number: 36
• Publication Date: January 24, 1969
• Content Type: LETTER

Declassified in Part - Sanitized Copy Approved for Release 2012/10/16: CIA-RDP79B00873A000800020036-6
January 24, 1969
Dear John,
STAT
STAT
This information, I hope, will satisfy your immediate needs.
I have arranged for who is the Program Manager to show STAT
you the units and discuss details with you Friday, the 31st of January.
Total price delivered including training session STAT
Sorry I won't get to see you this trip, but I feel confident Bal
and John and Parse can arise to the occasicinu
RLC:jal
Sincerely,
Director
Photographic Engineering Department
Declassified in Part - Sanitized Copy Approved for Release 2012/10/16: CIA-RDP79B00873A000800020036-6
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Declassified in Part - Sanitized Copy Approved for Release 2012/10/16: CIA-RDP79B00873A000800020036-6
PRIMARY STANDARD IB SENSITOMETER
MODEL PS-6809
The model PS-6809 sensitometer is the result of
years of experimental research and advanced systems analysis experience.
The most sophisticated sensitometers available for our use have all
fallen short of the degree of precision and repeatability we found necessary
in many of our test and evaluation programs. leveloped
the model PS-6809 sensitometer to provide the accuracy required in our
laboratories.
The important features of the model 6809 are:
1. Two exposure lamps are provided which have been calibrated against a
United States Bureau of Standards source. The lamps are calibrated at 50
nanometer intervals from 300 nanometers to 1000 nanometers. The spectral
output curve is completed through a computer program which interpolates
energy values at 10 nanometer intervals. In addition to the USA Standard
of 2850? K, the lamps are calibrated at 2650? K and 3000? K in order that
many special exposure conditions may be simulated.
2. A spectral irradiance curve for each Kelvin temperature is made from
the calibration data extending from 300 nanometers to 1000 nanometers.
The calibration data includes the lamp current required to achieve each of
the three Kelvin temperatures. Spectrophotometric traces are made of
the special front surface mirror, the dust cover glass, the step tablets,
and all filters supplied.
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3. A DC power supply is used, regulating the lamp current to ?0. 01% over the
normal operating range.
4. A digital readout is used to monitor lamp current so that the operator is
assured of repeatability.
5. A cylindrical drum shutter, having precision machined slits, provides
extremely accurate exposure timer when coupled to a hysteresis synchronous motor.
The variation is approximately 0.1%. The range of exposures with the drum are:
1 second, 1/2, 1/5, 1/10, 1/25, 1/50, 1/100 and 1/200th second. Auxiliary timers
are used for exposures up to five minutes.
In addition to data sheets showing the Absolute Log Exposure for each light
and exposure condition, the following hardware is provided:
a. A No. 5 colloidal carbon step tablet, fully calibrated, of 21
steps with a 0.15 density increment between steps.
b. A combination step and continuous wedge, calibrated as above.
c. Five calibrated glass filters to provide proper illuminance for USA
Standard Daylight, 1R, and color 1R conditions.
is confident that no sensitometer exists which is as precise STAT
and repeatable as the model PS-6809.
The serious worker who requires a precision instrument to serve as a standard
to which other less precise "working instruments" may be calibrated, can be assured
that the accumulative error of the model PS-6809 will be insignificant when compared
to any other segment of the photographic system.
The price of the PS-6809
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Declassified in Part - Sanitized Copy Approved for Release 2012/10/16: CIA-RDP79B00873A000800020036-6
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Declassified in Part - Sanitized Copy Approved for Release 2012/10/16: CIA-RDP79B00873A000800020036-6
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January 17, 1969
The program that we discussed on December 30, 1968 is now reaching
the final planning stages. The enclosed schedule roughly outlines the pro-
gram which we feel will prove very beneficial
We are presently planning to start the first session on Monday, the
27th of January, in order to take advantage of current
schedule.
The cost of the program is presently being calculated and we will send
it to you as soon as it is completed.
Also enclosed you will find an "Equipment Check List". Please fill
this out and forward it to us as it will help in our plans for take-home
assignments.
Thank you very much and we will be looking forward to your reply and
the arrival
RLA:ap
Encl.
Sincerely,
Photographic Engineering Group
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Declassified in Part - Sanitized Copy Approved for Release 2012/10/16: CIA-RDP79B00873A000800020036-6
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Declassified in Part - Sanitized Copy Approved for Release 2012/10/16: CIA-RDP79B00873A000800020036-6
OUTLINE FOR COURSE IN PHOTOGRAPHIC SCIENCE
The proposed outline is designed to cover the basic fundamentals of photographic
science. It is based on an eighteen-day schedule which consists of six sessions with
three days in each session. Also, the entire program is set up on an informal basis
so that special areas of interest may be developed and pursued.
First Session
1st Day: Photometry, sensitometry, IB Sensitometer, H&D Curve, Speed,
Contrast, Exposure photometry problem set.
2nd Day: Introduction to chemistry of photoscience with chemical experiment.
Emulsions and developers.
3rd Day: Densitometry, analysis of chemical experiment results, tone repro-
duction for a negative system.
Home Work: Photometry problem set covering sources, filters and system
responses.
Second Session
1st Day: Statistics and methods of experimental analysis, review of problem
sets, discussion of processing variables.
2nd Day: Experiment on photographic processing covering time, temperature,
agitation, etc. Recording of experimental results.
3rd Day: Discussion of experiment and statistical analysis of results. Deter-
mination of contrast, speed, etc.
Home Work: Statistics, problem set.
Practical photographic experiment involving photographing, pro-
cessing, and analyzing of special targets.
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Third Session
1st Day: Discussion of take home projects, lecture on reciprosity effects,
experimental study of reciprosity.
2nd Day:
3rd Day:
Discussion on papers, paper speed, contact printing, projection
printing and flare. Experiment on contact or project printing
for various papers. Recording experimental results.
Tone reproduction for film and papers including analysis of
experimental results. Introductory discussions leading to
special project.
Home Work: Experimental tone reproduction problems.
Fourth Session
1st Day: Discussion on the chemistry of photographic processing. Mixing
of chemicals for processing experiment.
2nd Day: Experiment on photographic effects of developer chemicals and
processing sequence.
3rd Day: Statistical evaluation of experimental results. Further discussion
of special project.
Home Work: Chemical problem set involving theory questions.
Fifth Session
1st Day:
2nd Day:
Discussion of chemical problem set, theory of reversal and
duplicating processes. Experimental reversal problem and
analysis.
Color theory, color sensitometry and densitometry, tri-color
curve plotting, discussion of available types of original and
duplicating films and papers.
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3rd Day:
Reversal duplicating film and paper.
Negative positive films and papers.
Spectral sensitivities, exposure condition, etc. for all.
Versamat theory and demonstration.
Home Work: Color project including exposure, processing and printing
of color film.
Sixth Session
1st Day: Examination covering entire program. Start on special project.
2nd Day: Continue on special project.
3rd Day: Finish special project. Review examination and entire program.
Comments:
Sessions will contain short quizzes to determine effectiveness of course.
All homework assignments are designed to require extra time between informal
sessions.
Homework will be based on equipment available to student at his location.
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Declassified in Part - Sanitized Copy Approved for Release 2012/10/16: CIA-RDP79B00873A000800020036-6
EQUIPMENT CHECK LIST
In order to plan meaningful take home assignments, it is necessary to obtain
Please fill out STAT
a general list of the photographic equipment available
this list and return to us as soon as possible.
35mm Camera (s)
Studio Lights
Film Processing Equipment
Sensitometers
Photometers
Densitometers
Types
Declassified in Part - Sanitized Copy Approved for Release 2012/10/16: CIA-RDP79B00873A000800020036-6