BRIEFING PRINT ENLARGER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A000500010014-2
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: October 8, 2004
• Sequence Number: 14
• Publication Date: June 1, 1964
• Content Type: PERRPT

Approved For ease 2004/11/30: CIA-RDP78BO477000500010014-2
SECRET
GROUP-1
Excluded from automatic downgrading
and declassification
1 June 614
10
SUBJECT: Briefing Print Enlarger
TASK/PROBLEM
1, To design and build a prototype enlarger for exposing high-
quality briefing prints in formats up to and including 20 x 24 inches
in size. Magnification to be in the 10 ? 60 diameter range. The
enlarger will be able to produce both black-and-white and color prints,
Changing from one capability to the other should be made with a mini-
mum of effort,
2, on 7 April 64 the contractor was authorized to proceed with Phase I.
i.e., to provide preliminary design, final specification and optical
design. Design studies applicable to this project and to PAR 224 were
started early in April. Manpower in the design group responsible for these
projects is being increased as engineers are available and as they
can be used efficiently. Design studies started during the, quarter are:
a, Mechanical design of the negative transport system.
These studies include loops of film with a metered scale coupled to film
driven metering rolls to measure; (1) along-frame coordinate and
(2) frame number,
b, Possible enlarger arrangement to provide a horizontal print
stock plates surface and a convenient fixed position for the vertical
gate negative handling system by folding "the optical path". No success-
ful arrangement was found, The primary problem is the required size
of the mirror m? about 20 x 30 inches, The problems in fabrication
mounting and maintenance of such a mirror would exceed gain in oper-
ational convenience. It is recommended that a horizontal axis optical
system without a mirror be used,
c. As part of the enlarger arrangement study, we have
proposed design parameters for a set of three objective lenses. These
lenses will operate at overall conjugate lengths of 50 to 80 inches
NGA Review Complete
SECRET
Approved For Release 2004/f 30 : CIA-RDP78BO477OA000500010014-2
 Approved For Fase 2004/11/30: CIA-RDP78BO4770W 500010014-2
SECRET
25X1
1 June 64
with optimum image quality at 61.5 inches. The longest focal length
lens of the set (EF - 4.7 inches) provides 8.6X to 15X magnification
and is the.same as the shortest focal length lens of the set of the
three lenses proposed for PAR 2249 3-15X Fluid Gate Enlarger. A single
lens design specification (see Appendix I9 PAR 2249 Specification
469-319 in this report) has been written for a "family" of six lenses
serving the requirements of both PAR 202 and PAR 224 for color blind
print stock.
3. During the next quarter.
a. Contracts will be let for design of the family lenses
for color blind print stock.
be Specification will be completed and contracts will be
let for the family of color corrected lenses.
c. Fabrication will begin on the breadboard model of the
negative transport system.
d. Design studies will be made on the platen and lens
focusing system.
SECRET
-6-
GROUP-i
Excluded from automatic downgrading
and declassification
Approved For Release 2004/11/30 : CIA-RDP78BO477OA000500010014-2