The Formatt 4 x 4" Circular Schott-Desag B270 Crown Optical Glass Polarizer - 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.
Formatt's Crown Polarizer enables you to achieve a level of optical performance previously unavailable. The polarizing film is fabricated between two pieces of Formatt's crystal clear water white optical glass. The absolute clarity of the glass combined with advanced polarizing material make crown Polarizing filters particularly effective on demanding scenes.
Formatt, a company with three generations of professional filter-making experience produces every filter to the highest technical standards. The finest materials, together with state of-the-art production technology have resulted in a standard of optical excellence unmatched anywhere else.
Note! Circular polarizers are specifically designed for use with auto-focus SLR cameras (They will also work on manual systems and video cameras without problems)
4 x 4" Hi Def Circular Polarizer Filter