Astrodon 1.25″ One Shot Color Luminance Filter (UV / IR Cut) is used primarily to “bracket” the color-corrected band of refracting telescopes. This filter can also be used as a “visible” filter in RGBV (red-green-blue-visible) astrophotography with reflecting telescopes.
Most digital/CCD cameras have built-in infrared filters, however an infrared filter may be used in addition depending on how far into the blue your primary lens is color-corrected. This filter blocks wavelengths shorter than about 400nm. If your camera does not have a built-in infrared filter, Astrodon’s One Shot Color Luminance UV/IR Cut filter is recommended, as it blocks all wavelengths longer than 750nm.