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Stacking Filters
You can also “stack” lters by threading another lter into the bottom of the rst.
Please note to check the transmission curves of the lters that you are stocking
to make sure they have some overlap otherwise all visible wavelengths may be
blocked or may be too limiting for smaller aperture telescopes.
Photography
Use the lters photographically by threading them into eyepieces used in tele-
extenders and universal camera adapters. Some cameras, camera adapters,
diagonals and barlow lenses also have the proper threads to accept lters directly.
Please note that a UV/IR blocking lter may also need to be used with mono-
chrome cameras to block wavelengths outside of the visible spectrum. Color cam-
eras generally have this lter already attached but monochrome cameras may not.
Change Filters Quickly and Safely Without Interrupting Observing
or Photography
There’s also an easy way to change the lter you want for observing or photogra-
phy. With a lter wheel or lter slider, it is possible to change lters without having
to remove your eyepiece or camera thus saving observing time and eliminating the
need to fumble around in the dark screwing lters onto accessories.
Figure 2. Attaching a lter to a 1.25" eyepiece with lter threads.
Figure 3. The Orion 1.25" 5-position (manual) lter wheel and the Orion Nautilus 1.25"
7-position (motorized) lter wheel.
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