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.
This filter combines the extreme warming capabilities of an 81EF with a Neutral Density .3 (one stop) filter. The 81EF decreases color temperature from 3850 - 3200 degrees Kelvin.
Lee polyester filters are available in 3 x 3" (75 x 75mm), 4 x 4" (100 x 100mm).