The Tiffen 85 138MM Round Filter corrects tungsten type B film (3200 degrees Kelvin) to daylight. Used when using type B film outdoors. Combinations with Neutral density are also available.
This filter is made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass, grinding flat to a tolerance of 1/10,000th of an inch, and then mounting to precision metal rings.
Type: Amber color conversion Size: 138 mm Grade: 85 Filter Factor: 1.6 (0.6 stop) Effect: Decreases color temperature Application: For use when photographing with tungsten-balanced film in daylight conditions Color Temperature: 5500 to 3400K Construction: ColorCore technology Front Filter Thread Size: 138 mm Front Lens Cap Size: 138 mm