85B is a color conversion filter for the use of tungsten type color films in daylight. It decreases the color temperature from 5500 Degree K to 3200 Degree K for the use of Type B tungsten film.
Heliopan 85 Warming Filter Features
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Excellent for copy stand lighting.
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Corrects color balance for standard processing.
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Allows photography indoor and outdoor on the same roll of film.