Vivitar 800MR F/8 Instruction Manual page 11

Filter UItilization Chart (Exposure Adjustment)
Kind of Filter Color
Normal Clear
Y52 Yellow
056 Orange
R60 Red
ND2X Gray
ND4X Gray
ND6X Gray
Under Daylight Under Tungsten Light
Exposure Shutter Stop Down
1 No Adjustment
2 1
2 1
6 2
2 1
4 2
8 3
Exposure Shutter Stop Down
1
1.5
1.5
4
2
4
8
-9-
No Adjustment
1/2
1/2
2
1
2
3