Using tungsten film in daylight will produce a bluish cast in the photograph. The 85 series will produce natural colours when shooting with tungsten film outdoors. A 85 filter will decrease the colour temperature from 5500K to 3400K & produce slightly cooler results than an 85B. Lee polyester filters measure 4 x 4" (100 x 100mm). Filter factor 1.8 (+2/3 stop).