Tasco 1575 User Manual
Page 74
MADDOX ROD LENS, 13MM DIA
Used in vision tests, the Maddox rod lens has a number
of molded glass grooves (cylinders) through which a
spot of light appears as a streak perpendicular to the
cylinders axis. Our understanding is that they are used
to uncover latent squints (phorias). When a distant
spot of light is viewed with the Maddox lens in front of
one eye, a line will be seen by the eye covered with
lens, while a spot of light is seen with the other eye. The line will be at
right angles to the grooves. When the grooves are horizontal, the line will
appear vertical. Someone with normal vision will see the line pass through
the spot of light, but someone with latent squint will see the light source to
one side of the line. 13mm diameter by 3mm thick. Unused.
L3476 $2.50
SET OF 6 IR PYRO FRESNEL LENSES
These were made to be used with the Pyroelectric
infrared sensors in security devices such as burglar
alarms. These lens arrays were made by Fresnel
Technologies, Inc. We don't have a clue about focal
length or which devices these were made to fit. You
get a set of 6, at least 4 have totally different charac-
teristics such as focal length, beam configuration, etc.
We have no way of testing them. Each of the 6 lenses is made up of multi-
ple fresnel arrays.
L3480 $12.00
3" DIAMETER PCX CONDENSER LENS, 4" FOCAL LENGTH MINT!
Unused plano convex lenses in mint condition in the
original "made in Japan" packaging. Appears to be
Crown glass. Edge thickness is 2mm, center thickness is
15mm. Uncoated. We have a nice quantity of these if
you want to incorporate them into your project!
L3561 $5.00 or 10 for $40.00
PRECISION FUJI 13MM SQUARE PCV CYLINDRICAL LENS -
17MM FL
This was made by the Fuji Photo Optical Company in
Japan. Cylinder lenses are used to transform a point of
light into a line image. We believe this was used on a
camera as some sort of adapter. Fuji part number
05090. Precision coated optics, -17mm focal length.
New/Unused!
L3587 $6.50
Page 72 - Lenses
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