The Tiffen 4 x 4" 85B Colour Conversion Filter reduces the colour temperature from 5500 to 3200K, allowing the use of tungsten-balanced film in daylight conditions. The warming effect of this filter requires a 0.6 stop increase in exposure for normal results.

This filter is manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and polishing it to a tolerance of 1/10,000th of an inch. It measures 4 x 4" / 101.6 x 101.6 mm.


Features:

- Colour conversion filter that decreases the colour temperature and produces a warming effect.
- Converts from 5500 to 3200K for using tungsten-balanced film in daylight conditions.
- Filter factor of 1.6 requires a 0.6 stop increase in exposure.


Specifications:

- Type: Amber colour conversion
- Size: 4 x 4" / 101.6 x 101.6 mm (0.2" / 4 mm thick)
- Grade: 85B
- Filter Factor: 1.6 (0.6 stop)
- Effect: Decreases colour temperature
- Application: For use when shooting with tungsten-balanced film in daylight conditions
- Colour Temperature: 5500 to 3200K
- Construction: ColorCore technology