The Hitech 6 x 6" 81D Filter is a color conversion filter that helps to slightly decrease color temperatures and provide a warming effect. The 81D filter adds more warmth to the image for use with tungsten films in natural lighting. It provides a decrease of 500K, helping to render the scene more similarly to incandescent illumination.
There is a 1.5x filter factor with this filter, requiring an increase of 0.6 stop for normal exposure. It measures 6 x 6" / 152.4 x 152.4mm and is constructed out of CR-39 dyed resin.
Color conversion filter helps to slightly decrease color temperatures and provide a warming effect.
Provides a decrease of 500K for use of tungsten-based films in daylight situations.