Formatt BF5X5CTC81EF4 - HItech Glass 5x5

The Formatt 5 x 5" 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.


Filter Quality

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