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The Formatt 62mm 81EF Color Conversion Filter controls the bluish coloration that affects daylight film. It can also remove excessive blue from the effects of electronic flash.
It's Autumn. The clouds are low hanging and the sky is "patchy blue". You've gone for a ride upstate to the mountains and the light in open shade is bluish. A photo taken of your girlfriend with daylight balanced film leaning against the side of a barn will yield bluish tones that she might not find particularly flattering.
An 81EF filter (the strongest in the 81 series) will more than replace the yellow missing from the image and place all skin tones on a distinctly "warmish" level. You might even consider using an 81EF at the beach to make a hot scene even "hotter". The 81 series (81A, B, C, D and EF) allows you to choose how much warmth you wish to replace in the image.
This filter can be used by the pro and amateur alike, weekend photo warrior or pro cinematographer and must be considered an essential addition to any photo arsenal.
Note: Whereas the 81 Series of filters creates a feeling of warmth, the 82 Series creates a feeling of coolness.
Formatt filters are made from Schott-Desag B270 Crown Optical Glass - a high-quality glass that assures you of color consistency from filter to filter
81 Series Conversion Factors
81 decreases color temperature from 3300 - 3200 Kelvin
81A decreases color temperature from 3400 - 3200 Kelvin
81B decreases color temperature from 3500 - 3200 Kelvin
81C decreases color temperature from 3600 - 3200 Kelvin
81D decreases color temperature from 3700 - 3200 Kelvin
81EF decreases color temperature from 3900 - 3200 Kelvin
In the Box
Formatt Hitech 81EF Color Conversion Filter (62mm)
Table of Contents
The 81 series adds warmth to the image
Good for general scenes 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
Decreases color temperature from 3900 - 3200 Kelvin