PRO Digital HGX Ultraviolet (UV) Filter - 77mm Next Generation Digital Anti-Reflection Multi Coating - Specially formulated to minimize internal reflections created by CCD and CMOS sensors in a digital SLR. REPELLAMAXTM 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.