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However, with reflectors (that are inherently better color-corrected than refracting-type scopes and lenses) most astrophotographers prefer to use a clear filter that is not NIR-blocked, to obtain as much luminance signal as possible in the shortest amount of time. For those astrophotographers who are comfortable using a non-NIR-blocked clear filter, this Astrodon clear filter is parfocal with the Astrodon Tru-Balance RBG filters. It lets you image with reflectors using the RBG filters from the LRBG set that is normally designed for optimum performance with refractors.

This filter is UV-blocked only, and is hard antireflection coated. It has >95% transmittance out to the extent of the CCD detector range, including the NIR region. The 49.7mm diameter filter is supplied with a centering gasket that fits the internal 2" filter wheel of SBIG STL-1001E, STL-1301E, and STL-6303E Research Series CCD cameras.