... used to select which light rays enter your camara lens. PL and PL-CIR filters have the same effect, but it is ... to increase the contrast and saturation in blue skies and white clouds. Size:25mm,27mm,28mm,30mm,30.5mm,34mm,37mm ... -coated w/o water repellent, Multi-coated with water repellent. PL filter 49mm,52mm,55mm,58mm,62mm,67mm,72mm,77mm,82mm ...