This four filter set is designed to balance the effect of any major colour temperature disparities between light source and film or sensor. This avoids the appearance of colour casts on the final image.
Filter
|
Conversion
|
Approx Exposure Increase
|
Mired
Shift |
| 85B |
5500K to 3200K
|
2/3 Stop
|
+131 |
| 85C |
5500K to 3800K
|
2/3 Stop
|
+81 |
| 80C |
3800K to 5500K
|
1 Stop
|
-81 |
| 80A |
3200K to 5500K
|
2 Stops
|
-131 |