The Tiffen 4 x 4" 81C light balancing filter allows you to decrease the colour temperature by 400K in order to slightly warm the image to match the colour quality of the lighting. When using an 81C filter, you will be able to achieve a 3200K balance when the dominant light source is 3600K. The warming effect of this filter requires a 0.3 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 grinding it flat to a tolerance of 1/10,000th of an inch. It measures 4 x 4" / 101.6 x 101.6 mm.


Features:

- Light balancing filter that decreases colour temperature and provides a warming effect.
- Subtracts 400K to achieve a 3200K colour balance from 3600K lighting.
- Filter factor of 1.3 requires a 0.3 stop increase in exposure.


Specifications:

- Type: Amber light balancing
- Dimensions: 4 x 4" / 101.6 x 101.6 mm (0.2" / 4 mm thick)
- Grade: 81C
- Filter factor: 1.3 (0.3 stop)
- Effect: Decreases colour temperature
- Application: For adjusting 3600K lighting to 3200K
- Colour temperature: -400K
- Construction: ColorCore glass