Haida CPL 95 Circular Polarizing C-POL Filter 95mm Polarizer Special alloy made frame, of Haida's normal metal ring thickness Reduces glare in water and reflective surfaces, great for foliage in making leaves less shiny Enhances Colors, Darken Blue Skies turning them into deep rich blues Protects your camera lens from dust, moisture, scratches and fingerprints Double threaded to stack additional filters such as: ND, UV, etc.