Neutral Density Filters - specification
| Factor | Density | Light transmission | F-Stop |
| C | D = logC | T = 1/C | F = logC/log2 |
| NDx2 | ND 0.3 | 50% | 1 |
| NDx4 | ND 0.6 | 25% | 2 |
| NDx8 | ND 0.9 | 12,50% | 3 |
| NDx16 | ND 1.2 | 6,25% | 4 |
| NDx32 | ND 1.5 | 3,12% | 5 |
| NDx64 | ND 1.8 | 1,56% | 6 |
| NDx100 | ND 2.0 | 1% | 6⅔ |
| NDx128 | ND 2.1 | 0,78% | 7 |
| NDx200 | ND 2.3 | 0,5% | 7⅔ |
| NDx256 | ND 2.4 | 0,39% | 8 |
| NDx400 | ND 2.6 | 0,25% | 8⅔ |
| NDx500 | ND 2.7 | 0,20% | 9 |
| NDx1000 | ND 3.0 | 0,10% | 10 |
| NDx2000 | ND 3.3 | 0,05% | 11 |
| NDx8000 | ND 3.9 | 0,012% | 13 |
| NDx32000 | ND 4.5 | 0,0031% | 15 |
| NDx64000 | ND 4.8 | 0,0015% | 16 |
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