Light rays which are reflected by any surface become polarized and polarizer filters are used to select which light rays enter your camera lens. The circular Polarizer filter allows you to remove unwanted reflections from non-metallic surfaces such as water, glass etc. It also will enable colors to become more saturated and appear clearer, with better contrast. This effect is often used to increase the contrast and saturation in blue skies and white clouds. Professional High Definition PHD filter reduces lens flare and ghosting caused by reflections Special Element Frame Special matte aluminum satin finish frame reduces reflections Black Rimmed Glass Black rimmed glass reduces light reflection around filter edges