Light rays reflected from any surface can be polarized, so polarizing filters are used to select which light rays enter your camera lens. CIR-PL filters allow you to remove unwanted reflections from non-metallic surfaces such as water, glass, etc. They also allow colors to become more saturated and appear clearer and more contrasty. This effect is often used to increase contrast and saturation in blue skies and white clouds. HOYA's polarizing filters do not affect the overall color balance of a shot. The filter features a High Transparency & Highly Resistant UV absorbing coating, which provides 25% higher light transmission than standard polarizing filters. The ultra-thin frame is compatible with wide-angle lenses. The glass was assembled via high pressure molding technology.