ProMaster 67mm Digital HGX CPL Filter Circular Polarizing Filter REPELLAMAX Element Resistant Coating. This EXCLUSIVE PROMASTER coating repels moisture, fingerprints, dust, dirt, and grime to retain every ounce of sharpness in your image. Hardened Optical Glass. Ultra hardened optical glass resists surface scratching and stands up to the most intensive use. Low Profile AntiReflective Frame. Ultra thin low profile frame prevents vignetting on super wide digital format lenses. The satinlike smooth finish helps to minimize reflected light. Next Generation Digital AntiReflection Multi Coating. Specially formulated to reduce the chance or internal reflections created by CCD and CMOS sensors in a digital SLR.