MET RO GON LENS

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001800050008-0
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 8
• Document Creation Date: December 28, 2016
• Document Release Date: May 24, 2011
• Sequence Number: 8
• Content Type: MISC

Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78B04747A001800050008-0
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Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78B04747A001800050008-0
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 Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78BO4747AO01800050008-0
Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78BO4747AO01800050008-0
 Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78BO4747AO01800050008-0
2:1 REDUCTION PRINTER
The purpose of the reduction printer is to transfer uncut film negatives of any
focal length to diapositive transparencies at exactly one half of their original
focal length and size. The maximum acceptable format on the negative side is
18 " x 1 WT. The reduced positive transparencies may be on roll film or on
9" x 948 glass plates. The projection lens is distortion free within the
measurable limits. The negative and positive stage plates are parallel, normal
upon the .axis of projection, and calibrated to fixed conjugate distances of the
ratio 2a1 a The resulting transparencies are, therefore, geometrically similar
to the respective negatives, without alteration of their inherent distortion
status Due to the high power of resolution of the projection lens, the full
contents of information on the film . negative may be transferred to the positive
image plane
The projection axis of the printer is horizontal. All components are rigidly
supported by a heavy base casting standing on three tubular legs equipped with
swivel rollers a
The negative plane is established by a piano-parallel glass plate on which are
engraved several sets of fiducial lines serving for centration of 18" x 18P41
9" x 18" and 9" x 9 e' exposure formats-Spool holding facilities are provided
for these formats. Films are. held flat in exposure position by a glass
pressure plate. Uniform illumination of the 18" x 18" area is furnished by a
cold cathode tube grid behind an opal diffusing screen. The light grid is con-
tained in a blower ventilated housing and is operated from a 15, 000 -volt AC
transformer mounted beneath the base casting. The light bar and the pressure
plate frame are hinged to the side of the stage casting, making the stage area
easily accessible for film centering. Fluorescent lighting from the objective
side of the stage is available for centering operation.
The projection lens is a specially designed 9 element optical system of 21 &4
focal length operating at f/12 field aperture. Two of the spherical surfaces
are _a,spherically deformed, a third is coated with a multi layer interference
filter which reduces the transmitted light to a narrow wave band, bracketing
the design wavelength of the system.. It has a half angular field of 130 51 and
renders axial resolution in excess of 100 lines per mm in the image fields. It
is equipped with a single disc, solenoid operated, shutter which is controlled
by manual switch or electric timer.
The positive stage has a stage glass plate which defines the image plane, and
a pressure plate which is manually advanced by lever action in order to place
the photosensitive emulsion in contact with the stage plate. If glass plates
instead of roll film are used, the pressure plate is converted to a plate holder
into which the individual plates may be inserted when the stage door is opened.
.Film supply and take-up magazines for darkroom loading are attachable above
and below the stage. A dark slides a film winding mechanism with exposure
counter, ,a series of interlocks and a film shearing blade are provided for
convenient and insured manual operation. Exposed glass plates may be stored
in a light tight container.
The control panel contains two electric timers, a series of indicator lights,
switches and fu-se post.
The printer has an overall length of 125" and a height of 70"? At the control
panel it is 45" wide. It weighs approximately 1300 pounds net and is shipped
in assembled condition. The power demand is 115 volts AC, 10 Amps
Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78BO4747AO01800050008-0
 Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78B04747A001800050008-0
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Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78B04747A001800050008-0
 Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78BO4747AO01800050008-0
Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78BO4747AO01800050008-0
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 Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78B04747A001800050008-0
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Sanitized Copy Approved for Release 2011/05/24: CIA-RDP78B04747A001800050008-0