B&W Filter Factors
| Filter Designation | Filter Color | Daylight | ||||
| Tiffen* | Leitz | Kodak/Wratten | Factor | Stops | ||
| Y1 | Y0 | 6 | K-1 | Light Yellow | 1.5X | 2/3 |
| Y2 | Y1 | 8 | K-2 | Medium Yellow | 2X | 1 |
| Y3 | Y2 | 9 | Deep Yellow | 2X | 1 | |
| G1 | YG | 11 | X1 | Light Green or Yellow-Green | 4X | 2 |
| 12 | 12 | Minus Blue | Dark Yellow | 2X | 1 | |
| G2 | 13 | X2 | Medium Green | 6X | 2-2/3 | |
| Or | O | 15 | G | Deep Yellow or Orange | 2.5X | 1-1/3 |
| 23A | 23A | Light Red | 6X | 2-2/3 | ||
| R1 | Red | 25 | A | Red | 8X | 3 |
| 47 | 47 | C5 | Blue | 6X | 2-2/3 | |
| * Tiffen eventually adopted the Kodak/Wratten numeric designations. | ||||||