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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. These particular Hitech filters measure 85 x 85mm and fit Hitech's 85mm filter holder. They will also fit the Cokin "P" series holder.
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