Filter
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RECTANGULAR INTERFERENCE FILTER/BEAMSPLITTER
2" X 7/8" X 0.05" thick. Not sure what the original
application was but it acts like a beamsplitter reflecting
about 75% and transmitting about 25%. Look thru it
and you'll see a blue tone, look at a reflection and it
appears to have a gold coating. Clearly will be a fun
piece to experiment with.
M2085 $0.50 or 10 for $3.50
N-3 NEUTRAL DENSITY FILTER, 63MM DIA
Glass neutral density filter, 63mm diameter by 6.3mm
thick. Box is marked N-3 density.
M2108 $1.25 or 10 for $10.00
MTD GLASS FILTER SET; RED, ND & AMBER
Filters are 30mm diameter, and mounting is 39mm dia.
Looks like they snap in place as there is a ring on the
back side that sticks out 4mm and is 33mm diameter.
Too big to be used in your 1-1/4" telescope eyepieces
but maybe you can get creative. The Neutral Density
one is quite dark and may make a decent moon filter.
We believe these were made for a military application.
M2140 $5.00
50MM X 50MM GREEN INTERFERENCE FILTER
This filter is reflective on both sides and shows a
deep green color when held up to a light. It loses it's
mirrored effect when looking at a light source. 50mm
long x 50mm wide x 1mm thick. We have a limited
supply of these.
M2147 $2.50
MOUNTED MOON FILTER FOR 2" EYEPIECES
Dark glass neutral density filter, mounted, ready to
screw right into your 2" eyepiece. 9mm thick. Reduce
the brightness and improve contrast to see the craters
and details of the moon's surface without eyestrain.
New/Unused.
M2618 $14.95
Filters - Page 53
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