Formatt 40.5mm Combination Linear Polarizing and 85 Schott-Desag B270 Crown Optical Glass Filter - 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.
Using tungsten film in daylight will produce a bluish cast. The 85 series will produce natural colors when shooting tungsten film outdoors.
The Formatt 85 series will produce natural colors when shooting with tungsten film outdoors.
What do you do when you must take some photos outdoors and all you have left is tungsten film? Using tungsten film in daylight will produce a bluish cast in the photograph. The 85 series of filters will "bring back", i.e. color balance the tones in your images. These yellow filters are used to correct differences in color temperature between the recording medium (film/video) and the light source.
This 85/Polarizer Combo Filter converts Type B (tungsten) film to daylight and produces slightly cooler results than the 85B.
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.