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Neutral Density Filter Factors Table

A table of ND filter strength in stops, decimal density (i.e. 0.3), and Hoya’s x-factor/Cokin’s ND#.

Stops Decimal Factor (B+W, Formatt/Hitech, Lee, ) ND#/#x Factor (Cokin, Hoya)
1 0.3 2
1.5 0.45
2 0.6 4
2.5 0.75
3 0.9 8
4 1.2 16
6 1.8 64
9 400
10 3.0 1,000
13 4.0 10,000
20 6.0 1,000,000
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