Haida Slim PROII Multi-Coated CPL Filter. Compare to Hoya HD or B-W MRC. - Made from high quality optical glass. - Features front thread for use with multiple filters / hoods. High Quality Optical Glass Multicoated Circular Polarizer Filter. Reduces glare in water and reflective surfaces. 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. - No risk of filter mount related vignetting ( shadowing ) in the image corners. Includes storage case.