GENTLEMEN:

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002900020004-5
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 5
• Document Creation Date: December 28, 2016
• Document Release Date: December 5, 2001
• Sequence Number: 4
• Publication Date: January 6, 1964
• Content Type: LETTER

Approved For Release 2002/01/02 : CIA-RDP78B04747A002900020004-5
100*~ W"
P. 0. Box 21113
Win Post Office
Weshitoaa, D.C.
6 January 196.
STPtiTINTL
Iftow
An evaluation ht been .de of the Technice-1 Description of a
proposed optical 1106d for the M Penorstie o ?i.e :per. No further STATINTL j
action T 11 be taken at this time pending the delivery and evvluttton
of the prototype P'enortuic 3t eoviewer.
I appreciate your interest in ta1di time to parepare the Teebnic 1
Description.
STATINTL
DECLASS REVIEW by NIMA/DOD
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 STATINT
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Technical Description
Proposed Optical Head for =
Panoramic Stereoviewer
STATINTL
This optical head will be similar to the STATINTL
Versatile Stereoscope, but some of the optics and mounting will be
redesigned to facilitate its use on the Panoramic Viewer.
The Versatile Stereoscope has a magnification range of 3X to
120X in three steps; 3X to 13X, 7X to 3OX and 28X to 120X. A mag-
nification of 120X may not be practical in the Panoramic Stereoviewer.
High magnification and high resolution require carefully controlled
conditions of stability and illumination such as in a microscope.
If the high magnification range is reduced to, for instance,
1LI.X to 60X the mechanical requirements will be less severe. Perhaps
the most desirable range may be achieved by two relay lenses, which
will result in lower cost and greater simplicity of design. Since
the relay lenses in the Versatile Stereoscope would have to be
redesigned to fit into the Panoramic Viewer anyway, nothing is lost
in the way of costs by changing the magnification range. However
the following initial description is based upon the magnifications
found in the Versatile Stereoscope.
Magnification change will be accomplished by rotation of a
turret containing three relay lenses with -43x, 1X and 4X magnifica-
tion respectively and rotation of a zoom control knob. The zoom
systems for each optical train are coupled by a single control knob.
This knob may be disengaged by drawing upward. Then the zoom
4-5
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"W, 1
systems are free to be varied by two smaller control knobs for
individual zoom for viewing photographs with different scales.
The head has zoom lenses with a magnification range of .7X to 3X.
Eyepieces of lOX will be used.
The zoom lenses are from the StereoZoom Micro- STATINTL
scope. They will be mounted in a pod similar to that which was
designed for the Versatile Stereoscope. Between the zoom lenses
and the eyepieces are a prism erecting system and a Pechan prism
which provides 360 degrees continuous image rotation. Difference
in focus between relay systems of different power will be achieved
by focusing the pod with respect to the relay system. Individual
focus between the left and right side of the same relay system will
be achieved by sliding the mirror located between the lens and the
film plane in a horizontal direction.
One eyepiece tube is focusable to match the acuity of the operators
eyes.
The eyepiece tubes adjust for interpupillary separation from
63 )to 72 mm and are held by a spring against the adjusting knob.
The relay lenses project the photographic image into the
object plane of the zoom system objective lens. Each lens has its
associative field lens near the intermediate image plane. These
are also mounted in a turret which rotates with the relay lens
turret.
Field flateners will provide for good focus over the entire
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.41:4
STATINTL
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STATINTL
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I