http://www.filmtools.com/schneid85fil.html8042Schneider Optics 85 & 81EF Filters 4 x 5.65"http://cdn.filmtools.com/media/catalog/product/4/1/4175.jpg239.20USDInStock/Camera & Accessories/Filters & Accessories/Camera & Accessories/Filters & Accessories/Camera Filters/More/Shop by Trade/Cinematographers/Filters & Accessories<ul>
<li>85 corrects the color of tungsten balanced film (3200K) when shooting in daylight (5600K)</li>
<li>Combine an 81EF with an 85 to achieve a warm look</li>
<li>81 under-corrects tungsten balanced film and provides a cool or bluish look</li>
</ul> Schneider Optics Color Correction Filters
81EF and 85.
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.
Encompassing a wide range of colors and densities, color correction filters are categorized into three main groups: Color Conversion, Light Balancing, and Color Compensating. Each can create a wealth of practical color-temperature corrections and excitingly creative color effects.
Two of the most often used color correction filters are the 85 and the 81EF.
Although todayﾒs film emulsions provide the cinematographer with great latitude and flexibility, the 85 still remains the industryﾒ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".239.20Schneider Optics