Using tungsten film in daylight will produce a bluish cast in the photograph the 85 series will produce natural colors when shooting with tungsten film outdoors a 85 filter will decrease the color temperature from 5500k to 3400k and produce slightly cooler results than an 85b this filter measures 85 x 85mm and fits the cokin p series holder note whereas the 85 series is used for tungsten film under daylight conditions use the 80 series of filters when using daylight film under tungsten l