Filter (4x4) 81EF

This light balancing filter helps decrease color temperature to slightly warm the image and match the color quality of illumination. The 81EF filter decreases temperature by 650K and requires a 0.6-stop increase in exposure for normal results.

Using ColorCore technology, the process involves laminating the filter substrate between 2 pieces of optical glass and grinding flat to a tolerance of 1/10,000th of an inch.