Orion 5564 1.25-Inch Luminance/IR Cutoff Astrophotography Filter IR filter blocks ultraviolet (UV) and infrared (IR) light wavelengths for higher contrast CCD images Advanced coatings applied to the precision polished optical glass minimize in-band reflections The 1.25" anodized aluminum cell threads into the nosepiece of an astrophotography camera or filter wheel This an excellent luminance filter for LRGB astrophotography Attaches easily to any 1.25" astrophotography accessory