TRANSMITTAL OF DOCUMENTS

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A000400020042-1
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 4
• Document Creation Date: December 28, 2016
• Document Release Date: November 8, 2004
• Sequence Number: 42
• Publication Date: April 15, 1966
• Content Type: LETTER

25X1
e5X1
peclass Review by NGA.
Approved Fo~elease 2004/11/30 :CIA-RDP78B047000400020042-
Post Office Box 67
Fort Davis Station
Washington, D. C. 20020
Attention
Subject
Reference:
tent is en:
is leased to a l+ceee five c iees each
of our 3rd a 4th Monthly Press Report for the
design and tal riction of a variable Ane a -ic Viewing
System. The reporting periods covered are February l*
1966 to March Is 1966 and March It 1966 to April 1, 19.
Total funds expended to date represent approximately
35% of total allocated contract funds. If you have any
queett ccerning this project, please contact the
writer directly.
very truly yours
Photogr tric C
recta Section
Approved For Release 2004/11/30: CIA-RDP78B04770A00040
"25X1
25X1
25X1
 Approved F&elease 2004/1.1/30 : CIA-RDP78B04*A000400020042-1
Third Monthly Progress Report
Design and Fabrication of Variable
Anamorphic Viewing System
0
Period. February 1, 1966 to March 1, 1966
25X1
Approved For.Release 2004/11/30 : CIA-RDP78BO477OA000400020042-1
 Approved Foelease 2004/11/30 : CIA-RDP7B04W000400020042-1
During this period the problem of correcting the chromatic
aberration of the prism system throughout the zoom range
has been solved. The correction of this aberration at
the edge of the field is marginal, and may prove un-
acceptable in the final unit. If this is true, the field
will be reduced until the chromatic aberration is accep-
table. The design data clearly indicates that imagery
will be satisfactory at 85% of full field; Thus, any
reduction in field size will be within the limit speci-
fied in the work statement.
?
Because of the lack of power in the prisms it has been
possible up to now to design the system without con-
sidering in detail the prism pivot points, and the trans-
verse position of.prism relative to.the center line of
the system. With the chromatic aberration problem re-
solved it is now possible to work on these detailed
problems. This requires working back and forth between
the drafting board to assure freedom from mechanical
interference, and the computer to establish that there
is no vignetting or image translation with zoom. So
far no analytical solution to this problem has been found,
and the iterative trial and error technique that is being
used is converging slowly. The mechanical design group
has been notified that the optical design is nearly
completed. They are providing guidance in the final
design process to assure compatibility of the optical
Approved For Release 2004/11/30 : CIA-RDP78BO477OA000400020042-1
 Approved FjWelease 2004/11/30: CIA-RDP.78B04 000400020042-1
?
design with mechanical requirements. Thus, there should
be no serious problems during the mechanical design of
the unit.
The design effort on the cylindrical zoom system is being
continued. It is considered advisable to carry this
alternate zoom system to design completion as a back up
system should the prism system develop insurmountable
problems at any stage of development. At present_a lens
power distribution and motion to give a zoom system
fitting the required space has been determined. Fol-
lowing conventional design procedures the individual com-
ponents are being corrected for aberrations. After this
correction the complete system will be designed.
Approved For Release 2004/11/30 : CIA-RDP78BO477OA000400020042-1