The Tiffen 4 x 5.65" 85 colour conversion filter reduces colour temperature from 5500 to 3400K, allowing the use of tungsten-balanced film in daylight conditions.

The warming effect of this filter requires a 0.6-stop exposure increase for normal results.

This filter is made from Water White glass and uses ColorCore technology, a process that laminates the filter substrate between 2 pieces of optical glass and polishes it to a tolerance of 1/10,000th of an inch. It measures 4 x 5.65" / 101.6 x 143.5mm.

-Colour conversion filter reduces colour temperature and provides a warming effect.
-Converts from 5500 to 3400K to use tungsten-balanced film in daylight conditions.
-Filter factor of 1.6 requires a 0.6-stop exposure increase.
-Water White optical glass for excellent clarity.