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This is the P164 Circular Polarizer Glass Filter from Cokin. It fits in the optional Cokin P Holder. Light rays which are reflected become polarized. Polarizing filters are used to select which light rays enter your camera lens. A polarizer helps make a blue sky bluer as well as making clouds stand out. It can remove unwanted reflections from non-metallic surfaces such as water or glass and also saturate colors providing better contrast. The effect can be seen through the viewfinder and changed by rotating the filter. The filter factor varies according to how the filter is rotated and its orientation to the sun.
Note: Circular polarizers are specifically designed for use with auto-focus SLR cameras (They will also work on manual systems without problems)