Sunlight, daylight, incandescent, fluorescent and other artificial light sources have their own characteristic color shade that varies significantly. Color correction filters help adjust these color temperature variations, changing the color content of the light to match the color response of the film and allowing the user to creatively modify the color in subtle ways.
Most of these filters are widely used when working with photochemical material depending on what type of film is used, either daylight or tungsten balanced, then if necessary convert the color temperature. Today in most cameras you can already choose the desired color temperature for each scene, so the use of these filters is for
With this you series obtain correct colors using daylight film indoors with tungsten light. The 80A filter allows to pass from 3,200 to 5,500 K with 2 stop compensation and the 80B filter allows to pass 3,400 to 5,500 K with 2 stop compensation.
For obtaining correct colors using tungsten film outdoors. Filter85 passes 5,500 to 3,400 K with 2/3 stop compensation, filter 85B allows to go from 5,500 to 3,200 K with 2/3 stop compensation and 85C allows to go from 5,500 to 3,800 K with 1/3 stop compensation, although it is also used to make a much warmer cold scene. It is possible to have a 85 color corrector combined with neutral density in a single filter, so we have 85N3, 85N6 and 85N9.
An alternative way to use the 85 in low light outdoors using a tungsten film is the LL-D filter, or low light scattering filter especially when using lenses that are not very bright since it does not require exposure compensation and thus saves 1/3 stop interval required by filter 85.
The 81 series filters are useful for working in cold light conditions with daylight films, specifically the 81EF filter converts from 3,850 to 4,140 K 2/3 stop, allowing you to create warmer tones and brighter colors on cloudy days, ideal for skin tones. The 812 filter is designed to add warmth to skin tones and reduce excess blue in outdoor shadows making it an ideal filter for portraits, and the Skin Tone Enhancer works the same way. These filters combined with some soft filters give ideal textures in skin tones.