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23X LENS ASSEMBLY - MICROFICHE PROJECTION?
We think these were made for microfiche projection,
but not certain. Beautiful brand new lens assembly in
the original packaging! Barrel is 34mm long x 28mm OD
with groove about 20mm from the front. Clearly made
to go into some instrument and be held in place using
the groove. Front element is 14mm diameter and back
element is 10mm. Multi-element, with coated optics.
Marked "Mag. 23X" Gloss black-enameled aluminum barrel. Makes a nice
color corrected magnifier, but has a narrow field of view.
L3204 $4.00
D.O. INDUSTRIES 50MM F/4.5 ENLARGER LENS
Unused in original box with front and back lens caps.
Iris operates with click stops from f/4.5 TO f/22.
50mm focal length. We've found them selling used for
up to $40.
L3221 $10.00
MTD NEGATIVE AIR SPACED DOUBLET, 15MM DIA X -667MM FL
Coated air spaced doublet, in a threaded mount. Clear
front lens diameter is 15mm, clear back lens is 10mm.
Mount is 25mm diameter by 17mm long. Focal length is
-667mm. Unused
L3254 $5.75
CYLINDRICAL LENS, PCX - 4" LONG X 1/8" WIDE X 3MM FL
Cylindrical lenses (also called astigmatic lenses) have at
least one surface that is formed like a portion of a
cylinder. They are used in rangefinders to produce
astigmatism, or the stretching of a point of light into a
line. Plano-convex cylindrical lenses have a positive
focal length, which makes them ideal for collecting and
focusing light for many imaging applications. These
cylindrical lenses measure 4" long x 1/8" wide x 1/16" deep, with polished
concave top and flat base surfaces, and ground ends. The edges along the
length may have some slight roughness due to their thinness. Focal length is
3mm. A great find for the optics hobbyist or experimenter!
L3289 $4.00 or 5 for $15.00
Lenses - Page 67
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