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Schneider Optics. 81EF & 85 Color Correction Filters. 6.6x6.6
Color Correction filters serve two key functions: they change the color content of the light to match the color response of the film, and they permit the user to creatively modify color in subtle ways.
85 filters are used to correct the color of tungsten balanced film when shooting in daylight. Most films are shot using tungsten film which is exposed indoors without the need for a filter. When the production moves outside into daylight, tungsten balanced film is also used, with the addition of an 85 filter in front of the lens. Experience has shown that this is a practical and cost effective way of managing the problem of shooting both indoors and outdoors with the resulting color temperature changes.
The 81 EF filter is a pale orange warming filter that can be used to control the bluish cast in images shot on cloudy days or in open shade. It can also be used simply to warm up a shot or to enrich skin tones. While often used in cinematography as a warming filter in combination with an 85 filter, sometimes a Director of Photography may prefer to use an 81EF filter INSTEAD of an 85 filter. This results in under correction of tungsten balanced film shot under daylight and provides a cool or bluish look.
Two of the most often used color correction filters are the 85 and the 81EF. Although today's film emulsions provide the cinematographer with great latitude and flexibility, the 85 still remains the industry's most commonly used color conversion filter. The 85 is primarily used to correct the color of tungsten balanced film (3200K) when shooting in daylight (5600K).
By combining an 81EF with an 85, over-correction is achieved which results in a warm look. Sometimes a Director of Photography may prefer to use an 81EF rather than an 85. When used alone in daylight, this filter under-corrects tungsten balanced film and provides a cool or bluish look.
However, if an 81EF is used with tungsten balanced film in tungsten light, it results in a warm look. Schneider has been careful to match both of these filters to their respective Kodak Wratten numbers.
They are available in the following sizes: Series 9, 41/2", 138mm, 4"x4", 4"x4.560" (Panavision size) and 6.6"x6.6".
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