Hoya Filter Factor Chart
| Filter Type | Filter factor | Adjust exposure | Filter Type | Filter factor | Adjust exposure |
| UV | 1 | 0 | 82C | 1.5 | 2/3 |
| 1B Sky | 1 | 0 | 81A | 1.4 | 1/2 |
| Polarizer | 3 - 4 | 1 2/3 to 2 | 81C | 1.5 | 2/3 |
| Circular PL | 3 - 4 | 1 2/3 to 2 | K2Y | 2 | 1 |
| FL-W | 2 | 1 | G(0) | 2.5 | 1 1/3 |
| FL-D | 2 | 1 | 25A | 8 | 3 |
| 80A | 2.4 | 1 1/3 | XO | 4 | 2 |
| 80B | 2 | 1 | X1 | 4 | 2 |
| 80C | 1.9 | 1 | ND2X | 2 | 1 |
| 85 | 2 | 1 | ND4X | 4 | 2 |
| 85B | 2.1 | 1 | ND8X | 8 | 3 |
| 85C | 1.8 | 1 | Intensifier | 1.4 | 1/2 |
| 82A | 1.3 | 1/3 | |||
| 82B | 1.4 | 1/2 |
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