Hitech 4x4" 81C Color Conversion Resin Filter

The 81 Series of filters control the bluish coloration that affects daylight film. They can also remove excessive blue from the effects of electronic flash. Good for general scenics when the photographer wishes to remove the bluish cast from open shade or just add warmth to the photograph, with an 81EF having the greatest effect.

Whereas the 81 Series of filters creates a feeling of warmth, the 82 Series creates a feeling of coolness.

Hitech resin filters are made from lightweight, optical resin and are 4 x 4" (100 x 100mm) x 1.5mm thick.

81 SERIES CONVERSION FACTORS

81 decreases color temperature from 3300 - 3200 degrees Kelvin

81A decreases color temperature from 3400 - 3200 degrees Kelvin

81B decreases color temperature from 3500 - 3200 degrees Kelvin

81C decreases color temperature from 3600 - 3200 degrees Kelvin

81D decreases color temperature from 3700 - 3200 degrees Kelvin

81EF decreases color temperature from 3900 - 3200 degrees Kelvin