81 series pale amber filters are designed to "warm" photos by reducing excess blue.
• They are rated in strength on the Kelvin color temperature scale and require minor exposure adjustment.
•••@81 converts light from 3300K to 3200K; requires +1/3 stop.
•••@81A converts light from 3400K to 3200K; +1/3 stop.
•••@81B converts light from 3500K to 3200K; +1/3 stop.
•••@81C converts light from 3600K to 3200K; +1/3 stop.
•••@81D converts light from 3700K to 3200K; +2/3 stop.
•••@81EF converts light from 3850K to 3200K; +2/3 stop.