ADDENDUM TO CONTRACT(Sanitized)MICRO-STEREOSCOPE AND BINOCULAR MICROSCOPE COMBINATION

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002300090006-2
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 5
• Document Creation Date: December 28, 2016
• Document Release Date: June 11, 2001
• Sequence Number: 6
• Publication Date: November 21, 1966
• Content Type: CONT

Approved For Release 2001/~'1~3~; ~~~I~P7A8LB0474 A002300090006-2
Addendum To Contract
Micro-Stereoscope And Binocular Microsco e Combination
The purpose of this addendum is to suggest so e possible alternate
solutions to increase the resolving power, cont ast, and secondary
color in the present design.
There are three areas which we would consider investigating, and
which would yield the most results in the shortest period with mi-
nimal cost.
The following outline describes the areas, time and cost figures for
each area. These figures are estimated with s me degree of accuracy,
however, they may vary in actual cost by a fact r of ~ l0ojo.
Declass Review by NIMA / DoD
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CONFIDENTL-~L
1. Optimization of the zoom portion of the system.
As can be observed on the aberration plots, (variations in coma,
as a function of zoom positions, limits the o~f-axis resolving power.
A T(I,o~
By changing the design of the zooming porn n, the full field high
contrast resolving power at the 1X zoom pos~.tion for all objectives
could be improved by a factor of 2 times.
Cost for this portion would run:
?
2.. Eyepiece design.
Since existing lOX wide field eyepieces have
best under particular operating conditions, i
ment could be closer to an optimum design,
been designed to function
t is felt that the instru-
using specially designed
eyepieces. The high contrast resolving pow r could have an expected
increase of about 10 to 20 percent at the edg of the field while main-
taining adequate eye relief for use with eyeg asses. In addition, since
the exit pupil of the system is in a rigidly co stant position, even while
changing magnification, it would be desirabl to maintain this constant
position for all field points. This can be ac ieved by carefully cor-
recting the spheric aberration of the pupil. hile this correction does
CONFIDENTIAL
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not add to the resolving power of the instrume
operator fatigue over extended periods of use.
kidney-shaped dark patches in the field and re
head in order to see the total field, a condition
cause considerable eye fatigue to the user. T
new lOX wide field eyepiece would be:
A002300090006-2 3
t, it does decrease
Many eyepieces have
uir e movement of the
which certainly must
e cost of designing a
?
The additional cost of manufacturing one set o
type would run approximately
3. Reduction of secondary color.
The limiting axial image defect of the system ;
aberration. This results in a purplish imagin;
a greenish yellow background haze. This chrc
have considerable effect on the imaging of low
be witnessed by the use of color filters with ar
microscope. In anon-quantitative manner, th
as a background haze surrounding a bright spo
structured low contrast objects. Although it is
change in MTF at higher frequencies of low co
from a 2X reduction in secondary color, an inc
10 percent might be expected.
CONFIDENTL-~L
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eyepieces for the proto-
s secondary chromatic
of black objects with
matic condition could
contrast targets as can
ordinary achromatic
effect can also be seen
and thus affecting fine
difficult to predict the
itrast targets resulting
rease of approximately
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Reduction of secgndary color is a rather tedi
ful glass choice along with large amou:~ts of
reduction could certainly be achieved by the
but this material has a cost of approximatel
tical glass. Use of other materials, such as
crowns, might increase the cost of glass by
not affect the total cost of the instrument by
ous task requiring care-
omputing. Considerable
se of a mineral flourite,
20 times the average op-
short flints and phosphate
factor of two and would
y great degree.
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 Addendum to Contract-
Micro-Stereoscope and Binocu
Microscope Combination
21 NOu 1066