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Kodak 3x3" (75mm) 81EF Color Conversion Wratten 2 Optical Gel Filter - The 81 Series of filters controls the bluish coloration that can affect daylight film. They warm scenes shot on cloudy days. They can also remove excessive blue from the effects of electronic flash.
These filters are also good for general scenics when the photographer wishes to remove the bluish cast from open shade or just add warmth to the photograph.
Kodak gelatin filters are available in 3 x 3" (75 x 75mm), 4 x 4" (100 x 100mm), 6 x 6" (150 x 150mm) and 14 x 18" (350 x 450mm).
Note: The 81 series is available in grades from 81 through 81EF , with 81EF having the warmest effect
Wratten 2 Improvements
Easier to handle
Color consistent today, and 6 months from now as well
Wratten 2 Optical Filters are less sensitive to humidity, less prone to static cling
Fingerprint removal is also easier
81 Series Color Conversion Chart
81 decreases color temperature 100 Kelvin
81A decreases color temperature 200 Kelvin
81B decreases color temperature 300 Kelvin
81C decreases color temperature 400 Kelvin
81D decreases color temperature 500
81EF decreases color temperature 700 Kelvin
Table of Contents
3x3" (75 x 75mm)
Adds significant warmth; creates warmer tones and brighter colors on overcast days or when shooting with electronic flash