IR filter blocks ultraviolet (UV) and infrared (IR) light wavelengths for higher contrast CCD images. This an excellent luminance filter for LRGB astrophotography. Advanced coatings applied to the precision polished optical glass minimize in-band reflections. Attaches easily to any 1.25" astrophotography accessory. The 1.25" anodized aluminum cell threads into the nosepiece of an astrophotography camera or filter wheel.