Using tungsten film in daylight will produce a bluish cast in the photograph. The 85 (KR) series will produce natural colors when shooting with tungsten film outdoors. A #85 (KR12) filter will decrease the color temperature from 5500K to 3400K and produce slightly cooler results than an 85B (KR15).
NOTE: Whereas the 85 (KR) series is used for tungsten film under daylight conditions, use the 80 series of filters when using daylight film under tungsten lighting.
85 SERIES COLOR CONVERSION CHART
An 85 (KR12) decreases the color temperature from 5500-3400 degrees Kelvin
An 85B (KR15) decreases the color temperature from 5500-3200 degrees Kelvin
Filter factor 1.8 (+2/3 stop)