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4-1/8" DIA NEC TV PROJECTION LENS
Unused beauty. NEC TV projection lens. Designed for
use in big screen TV projection systems. Front clear
lens diameter of 4-1/8", rear clear lens diameter of 3
7/8", barrel length of 6 1/4" x 5 1/8" diameter (front)
and 4 5/8" diameter (rear), multi-element (appears to
be all glass as the lens assembly weighs 5 pounds), with
coated optics. Black plastic barrel with 5/8" wide
notched front grip ring and 5 1/8" diameter x 3/4" wide barrel-center
threaded mount. The lens projects a large image in a short distance. Great
for education projects such as slide or transparency projector, etc in addi-
tion to TV projection. Designed to be nearly in contact with subject sur-
face. The number 542 is stamped on the barrel and may be the NEC model
number. We haven't taken one apart, but it looks like different types of
large diameter optical elements. Includes black plastic front and rear lens covers.
L3294 $15.00
COBURN SUPREMACY 71MM DIAM. SEMI-FINISHED
HARD RESIN LENSES
Military surplus plastic lens blanks, manufactured by
Coburn Optical Industries, Inc. of Muskogee OK. Made
from CR39 resin, these Accommodator model concave
lenses are impact-resistant (not shatterproof or
unbreakable), are 71mm diameter and feature a 22mm
diameter low-segment slight magnification zone (shown
in the listing picture). Ground 8mm thick edge; approx-
imately 15mm depth. Unused stock, in the original wrapping and boxes.
Price is for a set of 2.
L3309 $4.50
B&L STEREO RHOMBOID ARM
Made by Bausch & Lomb for their Model 240 Aerial Photo
Interpretation Zoom Stereoscope. Catalog #53-70-28.
Our understanding is that the instrument has two of these
arms and optional stereo lenses that fit on the end (we
have some). It's quite an interesting piece with lots of
optics in it. If you look straight thru the top section, you
get a clear upside down image. The top section rotates,
and the image rotates as well. If you turn it 180 degrees, the image becomes
right side up and correct left to right. There is also a control that moves one
of the lens assemblies and appears to zoom the image a little. Inside is a Right
Angle Prism with 1 inch square faces. Also an elliptical front surface mirror,
16mm x 22mm, two cemented doublets, and 5 single element lenses. Clearly an
expensive piece. If you have the Model 240 instrument, then you need two of
these as spares. If not, then what a great optical piece to experiment with.
L3313 $22.50
Page 68 - Lenses
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