With the new generation of HTC polarizing foils, the B+W 30.5mm Kaesemann High Transmission Circular Polarizer MRC Filter helps to diminish reflections and glares. The filter has Kaesemann HTC polarizing foils with high translucency and 99.5% light transmission. These foils are placed between high-grade, plano-parallel optical glass and precision-polished to get an accurate plano-parallel surface, which is paramount for photography using a telephoto or apochromatic lenses. The filter has a multi-resistant coating to protect it against humidity and dust. This 30.5mm filter features an F-Pro brass ring that does not bind to the aluminum housing of the lens, which prevents jamming and enhances durability.