TECHNICAL DESCRIPTION AND DESIGN OBJECTIVE FOR (Sanitized) HIGH POWER STEREO COMPARATOR HEAD

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001500030094-0
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 6
• Document Creation Date: December 28, 2016
• Document Release Date: February 5, 2002
• Sequence Number: 94
• Publication Date: September 8, 1964
• Content Type: REPORT

8 3 3 7 STATINTL
Approved For Release 2002/06/17 : CIA-RDP78B04747A0015 94-0
TECHNICAL DESCRIPTION
DESIGN OBJECTIVE FOR
STATINTL
HIGH POWER STEREO COMPARATOR HEAD
This instrument is to be used as the optical viewing sub-
system of a photographic measuring instrument. It is a major
redesign of the High Power Stereoviewers manufactured on pre-
~ _ -- ---- _
vious
contracts with the U. S. Government. The primary change
is in the optical system, to enable the reticles to be placed
in an intermediate image plane, rather than in the eyepieces
where they can be displaced when adjusting the Interpupillary
Distance (IPD). Mechanical changes are required to accommodate
the optical changes. In addition, the eyepiece angle will be
adjustable.
The instrument consists' of two
DynaZoom Lab-STATINTL
oratory Microscopes coupled with an optical system to form a
stereoviewer. The DynaZoom pod has a continuously variable
magnification from 1X to 2X. With 5X and lOX eyepieces and
2.6X, 3.5X, 6X and lOX objectives, a magnification range from
13X to 200X. is covered. The 3.5X and 6X objectives are not both
needed to cover the magnification range, but the 3..5X object-
ive gives a wider field and the 6X objective gives higher
resolution.
Each optical system consists of an objective, the zoom
elements, a penta prism to direct the path horizontally, an
image rotation prism (Pechan), reticle, a field lens, a mirror
to incline the path toward the eyepieces, a 1X relay lens,
a field lens and finally the eyepiece.
DECLASS REVIEW by NIMA/DOD
Approved For Release 2002/06/17 : CIA-RDP78B04747A001500030094-0
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Following are the objectives used with this instrument:
Catalog #
Magnification Focal Length
Numerical
Aperture
31-10-07
2.6X
40mm
0.08
31-10-06
3.5X
30mm
0.09
31-10-18
6 X 22.7mm
0.17
31-10-17
10 X 16mm
0.25
The objective lenses are mounted in a four-position center-
able nosepiece. The 3.5X, 6X and lOX objectives are parfocal
and require very little refocusing when changing objectives.
The zoom is adjusted by means of a knob on the top of each
pod. It is graduated from 1X to 2X in tenths.
The housing above the zoom system has been redesigned and,
due to the complexity of the penta prism mount, the ability to
provide monocular viewing or-photomicrography has been omitted.
The Pechan prism rotates the image continuously without
limit. 180? rotation of the prism rotates the image 3600. The
prism mount has a knurled knob for turning and numbers to indi-
cate approximately the amount of image rotation.
The reticle is mounted in a two-position slide, so that the
reticle may be moved out of the field of sriew. The reticle will-
consist of an engraved and filled black dot, 0.016+ .004mm, in
the center of the field.
The IPD of the eyepieces is adjustable by means of a lever
through a range of 55 to 72mm. The eyepieces are nominally 30?
to the horizontal and are adjustable + 7-1/2? for operator
convenience.
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Approved For Release 2002/06/17 : CIA-RDP78B04747A001500030094-0
Adjustment of the eyepiece angle causes image rotation.
A graduated scale reads the eyepiece angle. This angle must
be transferred to a slip ring to set the "Zero" index for the
Pechan prism which automatically compensates for the image
rotation due to changing the eyepiece angle.
The centers of the objectives will be nominally 12.102
inches apart. Dimensions for mounting to the comparator are
shown on the enclosed outline drawing, (D588337-003).
During the course of a measurement sequence, the Zoom knob
and the image rotation prism must not be rotated. The nosepiece
must not be rotated nor the centering adjustment moved.
Following are the eyepieces to be used:
Catalog # Magnification
31-05-03 5X
31-05-60 lOX W.F.
Resolution, field of view, etc., depend on the combination
of eyepiece and objectives used and the position of the zoom
system. The following table gives the nominal field size for
combinations of the above listed eyepieces and objectives when
the zoom is at 1X. When the zoom is at a position other than
1X, the total magnification is multiplied by the zoom magnifica-
tion, and the field is divided by the zoom magnification.
Eyepiece
Objective
Magnification
Field
5
2.6
13.
7.0mm
5
3.5
17.5
5.2mm
10
2.8
26
7.0mm
5
6
30
3.0mm
10
3.5
35
5.2mm
5
10
50
1.8mm
10
6
60
3.1mm
10
10
100
1.8mm
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Resolution cannot be conveniently expressed as so many
lines per millimeter per power, because of the interchange of
objectives and eyepieces,
Each eyepiece, zoom system and objective will be inspected
in test fixtures and will meet the rigid
QualitySTATINTL
Assurance standards for a DynaZoom Laboratory Microscope.
These tests include resolution,coma, astigmatism, etc.
With the lOX eyepieces, the zoom at 2X and the lOX object-
ive, the instrument will have an axial resolution of approxi-
mately 700 lines per mm.
STATINTL
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STATINTL
-Approved se- 2002/06/17 : CIA-RDP78BO4747AO01500030094-0