Technical Specifications of Zomei Ultrathin Circular Polarizing Filter CPL Filter Only 4.68mm thickness, Wide-angle lens compatible ultra thin frame. Polarization rate up to 99.9% and transmittance up to 99.7%. Made with no compromise. Glass mounted with high pressure press technology. Original AGC Optical Glass from Japan. All Materials Used in this filter Meet the Requirements of European Union's standards of Environ Ment Protection-ROHS(Restrictions on Hazardous Substances). CIR-PL filters allow you to remove unwanted reflections from non-metallic surfaces such as water, glass etc. They 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.
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