The 81 Series of filters control the bluish coloration that affects daylight film. An 81C will render skin tones nearly normal as well as eliminate the stronger bluishness of open shade on very clear days. The 81C is slightly stronger than an 81B and is also used for general landscape photography on cloudy days as well as to add additional warmth in portrait photography.
This filter measures 130 X 170mm and only fits the Cokin X-PRO series holder..
Filter factor 1.2 (+1/4 stop)