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he Formatt 80B Glass Filter is blue. It is used to balance daylight film under artificial, tungsten or standard (household) incandescent lighting.
You've been given an assignment to do some slide copying on a copy stand. Unfortunately, you only have daylight film and you notice that the copy stand is loaded with 3400K photofloods. Not to worry! An 80B is a strong dark-blue filter that will balance your colors back to reasonable normality. This filter can also be used as a "conversion" filter for when you are shooting in a room with incandescent light (household light bulbs) and daylight film.
This filter allows you to "balance", i.e. bring back, correct color tone to your images. There is some loss of film speed that may require the use of a tripod but, at least, your photos will demonstrate the proper tonality they so richly deserve.
80 Series Conversion Chart
80A increases color temperature from 3200-5500K (commonly used with 3200K lamps)
80B increases color temperature from 3400-5500K (commonly used with photoflood lamps)
80C increases color temperature from 3800-5500K (commonly used with flashbulbs)
80D increases color temperature from 4100-5500K (commonly used to remove extreme orange or red)
Absorbing Cell Technology
The secret to Formatt's consistency in filter design lies in its unique "Absorbing Cell Technology" (A.C.T.); This unique process allows color correct dyes to be applied to optically pure, wafer thin absorbing cells and offers a controllability that ensures the smoothest grad lines and consistent color across the whole filter surface.
This process is revolutionary compared with conventional filter dying techniques by eliminating the need to directly coat the glass surface itself. The repeatable performance gained through A.C.T. ensures that at any time you have to swap like filters for like filters mid shoot, you can do so with confidence with no discernable differences in color or density.
Each filter is guaranteed flatness to a maximum 2-wave value and comes with an individual reading from a laser interferometer. Every filter is carefully verified with a densitometer and spectrophotometer to ensure consistent and accurate transmission, before leaving the factory - the result is an absolute purity of image that eliminates any unwanted colorcast caused by conventional greenish soda-lime glass.
In the Box
Formatt Hitech 4 x 4" 80B Color Conversion Schott-Desag B270 Crown Optical Glass Filter
Table of Contents
4 x 4" (100 x 100 x 4mm)
4 (+2 stop)
Balances daylight film for use with most standard tungsten lighting, studio lighting and copy stand lighting
Used to shoot daylight film under artificial (household) lighting conditions