85 series dark amber filters are used for major warming of photos.
• They are also engineed to convert daylight (5500K) for use with tungsten film (3200K to 3800K).
•••@85 converts light from 5500K to 3400K for use with type A tungsten film in daylight; requires +2/3 stop.
•••85B converts light from 5500K to 3200K for use with type B (most common) tungsten film; +2/3 stop.
•••@81C converts light from 5500K to 3800K and is for mixed lighting (ex:house lamps + window light); +2/3 stop.