Promaster 72mm 81A Color Conversion Glass Filter
81A Color Conversion Glass Filters 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 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
- 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
- Converts tungsten 3200K film to 3400K lighting
- 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
| Type | Color Conversion |
| Size | 72mm |
| Grade | 81A |
| Filter Factor | +1/3 stop |
| Multi-Coated | No |
| Effect | Creates warmer tones and brighter colors on overcast days or when shooting with electronic flash |
| Application | Great for improving flesh tones |
| Color Temperature | Decreases color temperature from 3400-3200 Kelvin |
| Construction | Glass |
| Front Filter Thread Size | 72mm |
| Front Lens Cap Size | 72mm |
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