B+W 67mm Circular Polarizer Glass Filter SHPMC - 65-062160 B+W 67mm SH-PMC Circular Polarizer Glass Filter - Slim Light rays which are reflected become polarized. Polarizing filters are used to select which light rays enter your camera lens. They can remove unwanted reflections from non-metallic surfaces such as water or glass and also saturate colors providing better contrast. The effect can be seen through the viewfinder and changed by rotating the filter. Specifications: B+W 65-062160 67MM Slim Circular Polarizer SHPMC Lens Filter. Type :Circular Polarizer. Size :67 mm. Grade :Not Applicable. Filter Factor :Between 2.3 and 2.8 (approx. +1.3 stops). Multi-Coated :Yes 16 Layer Multi-Coated. Rotating :Yes. Effect :Removes reflections and increases color saturation without affecting the overall color balance. Application :Nature, travel, outdoor photography. Color Temperature :Not Specified by Manufacturer. Construction :Schott Glass. Front Filter Thread Size :Not applicable. Front Lens Cap Size :Not applicable.