NiSi Cinema 4 x 5.65" True Color Pro Nano Linear Polarizing Filter Lowepro Specials Other great features include: carbon Other great features include: carbon fiber polycarbonate composite body A rubber collar and clasp makes it easy to mount the OCF Speedring on the off camera flash The NiSi Pro Nano coating assists in reducing unwanted reflections as well as creating a waterproof and scratch resistant layer to assist in the cleaning process of fingerprints 65" True Color Pro Nano Linear Polarizing Filter is designed to reduce the reflections from non metallic surfaces as well as increase saturation and vibrancy in the sky and foilage