RainbowImaging 46mm Pro 1D PRO1-D Slim CPL Circular Polarizer filter (Multi-Coated) Ultra thin 1mm glass; low profit frame; Multi-Coated glass. Increases color saturation, darken blue skies so white clouds stand out and eliminate reflections from non-metallic surfaces like glass or water. Equipped with black rimmed glass to reduce the chance of light reflecting off the edge. Low Profile Frame Ultra thin filter frames (3MM) to help avoid vignetting on super wide angle lenses are also designed to hold. Equipped with a straight knurling edge for non-slip, easy attachment and removal.