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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.
This filter measures 85 x 85mm and fits the Cokin P series holder.
Whereas the 81 Series of filters creates a feeling of warmth, the 82 Series creates a feeling of coolness.
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
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Comments about Cokin P037 Warming (81EF) Resin Filter:
This is like any of the other Cokin filters and will go right in front of the polarizer. I tried several shots with and without the warming filter and wound up adding the warming tones in post production where I had not used it on camera. Very good effect and gives great tones to landscape shots.
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