The Haida NanoPro Circular Polarizer Filter helps to reduce reflections and glare by filtering out light that has become polarized due to reflection from a non-metallic surface. They can remove unwanted reflections from non-metallic surfaces such as water or glass and also saturate colors providing better contrast. Circular polarizers are helpful for use with digital cameras and autofocus lenses where a linear polarizer will often disrupt auto exposure and focus features. The filter is constructed from K9 optic glass with 10 layers double-side Nano coating for increased clarity as well as color fidelity.