Orders placed after 4pm on weekdays will not ship until the next business day. Orders placed after 12pm Fridays will not ship until the following Monday.
Faster shipping methods may be available; just upgrade during checkout.
*Some exclusions apply.
Enter new zip code to refresh estimated delivery time.
The Optiflex 81 Series of filters control the bluish coloration that affects daylight film. They 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 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.
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.
Thin enough for use in gelatin filter holders, but still rigid enough to prevent warping and buckling
Their resin base also makes them much more scratch-resistant than gels
You can clean them just like a glass filter
Optiflex filters are made from the same dyed-through optical resin as rigid Hitech filters- so they deliver the same superior image quality
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
In the Box
OptiFlex 3x3" 81A Color Conversion Resin Filter
Guaranteed Against Manufacturer's Defects
Table of Contents
Show moreShow less
81A Color Conversion
3 x 3" (75 x 75 x .3mm)
The 81 series adds warmth to the 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 degrees Kelvin
Front Filter Thread Size
Front Lens Cap Size
OptiFlex 3x3" 81A Color Conversion Resin Filter Review