TIFFEN 4X5.65 80D FILTER
The Tiffen 4x5.65" 80D 0.3 Stop Color Conversion Filter helps to increase the color temperature from 4200 to 5500K, allowing the use of daylight-balanced film in tungsten-lit conditions. The cooling effect of this filter requires a 0.3-stop increase in exposure for normal results.
This filter is made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding flat to a tolerance of 1/10,000th of an inch. It measures 4 x 5.65" / 101.6 x 143.51mm.