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The Cokin Z-PRO 026 (81A) 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 leaning against the side of a barn with daylight balanced film will yield bluish tones that she might not find particularly flattering.
An 81A filter will replace some of the yellow missing from the image and bring her skin tones back to a more appealing level. The 81 series (81A, B, C, D and EF) allows you to choose how much warmth you wish to replace in the image.
The Z-PRO Series is recommended for focal lengths of 20mm onwards (in the 35mm format). This filter is made of CR39 Resin which is a reputable lightweight and unbreakable optical material also used for ophthalmic glasses.
Note: 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 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
Cokin Z-PRO 026 81A Color Conversion Resin Filter
Warranted Against Manufacturer's Defects
Table of Contents
Z-PRO Color Conversion
100 x 150mm (4 x 6"), 1.5mm thick
The 81 series adds warmth to an image
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
Decreases color temperature from 3400 - 3200 Kelvin