Hoya 72mm NXT Circular Polarizer FilterThe Hoya NXT Circular Polarizing Slim Frame Glass Filter allows the photographer to remove unwanted reflections from non metallic surfaces such as water, glass, etc. Polarizers also 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. This circular polarizer from Hoya produces these effects without affecting the overall color