Conversion Filters for Color Films
These filters are intended for use whenever significant changes in the color temperature of the illumination are required (for example, daylight to artificial light). The filter may be positioned between the light source and other ele- ments of the system or over the camera lens in conven- tional photographic recording.
Filter | Filter | Exposure Increase | Conversion | |
Color | Number | In Stops* | in Degrees K | |
| 80A | 2 | 3200 to 5500 | |
Blue | 80B | 12/3 | 3400 to 5500 | |
80C | 1 | 3800 to 5500 | ||
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| 80D | 1/3 | 4200 to 5500 | |
| 85C | 1/3 | 5500 to 3800 | |
| 85 | 2/3 | 5500 to 3400 | |
| 85N3 | 12/3 | 5500 to 3400 | |
Amber | 85N6 | 22/3 | 5500 to 3400 | |
85N9 | 32/3 | 5500 to 3400 | ||
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| 85B | 2/3 | 5500 to 3200 | |
| 85BN3 | 12/3 | 5500 to 3200 | |
| 85BN6 | 22/3 | 5500 to 3200 |
*These values are approximate. For critical work, check by accurate tests, especially if you use more than one filter.
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