Tiffen Filters 6X4 WARM ULTRA POL LINEAR - W64WUPOL
Tiffen's 4x6" Warm Ultra Linear Polarizers polarize light "a little more" than regular polarizers.
Light rays which are reflected become polarized. Polarizing filters are used to select which light rays enter your camera lens. They 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.
This filter is a combines the effects of a Tiffen Ultra Polarizing filter and an 812 filter.