1,The polarizability is 99.9% and the transmittance is 99.7%. No compromises. 2,Made of AGC optical glass, made by high pressure pressing technology. 3,Any surface reflected light may be polarized, so the polarizing filter is used to select the light that enters the camera lens. 4,CPL filters can remove unwanted reflections on non-metallic surfaces such as water, glass, and can make colors more saturated, better contrast, and clearer. This effect is often used to increase the contrast and saturation of blue sky and white clouds. 5,With ultra slim CPL filters, the possibility of vignetting, especially when using a wide-angle lens, is greatly reduced. 6, 1 x Polarizing Filter Lens material: imported optical glass Frame material: magnesium alloy, surface polished, matte black, anti-reflective Size: 37/ 40.5/49/52/55/58/62/67/72/77/82/86mm Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.