The PROMASTER Digital HGX UV filter absorbs the ultraviolet rays which often makes outdoor photographs hazy and indistinct. It is a multi-purpose fine-weather filter for color as well as black and white photos and also serves as a permanent lens protector. PROMASTER Digital HGX filters are the most advanced optical filters available today for digital photography featuring: Next Generation Digital Anti-Reflection Multi Coating ? Specially formulated to minimize internal reflections created by CCD and CMOS sensors in a digital SLR. REPELLAMAX? Element Resistant Coating ? This EXCLUSIVE PROMASTER coating repels moisture, fingerprints, dust, dirt, and grime to ensure the sharpest images possible Hardened Optical Glass ? Ultra hardened optical glass resists surface scratching and stands up to the most intensive use. Low Profile Anti-Reflective Frame ? Ultra thin low profile frame helps prevent vignetting on super wide digital format lenses. The satin-like smooth finish helps to minimize reflected light. Black Rimmed Glass ? The outer rim of the filter glass is treated with a special black-ink.