The Density

Cokin Standard (ND2,ND4,ND8)

Cokin’s Standard ND scale is a logarhytmic scale.
The formula: NDx is log2(x)=y. for example:
ND4 is log2(4)=2. So 2 stop reduction.

Density Table

Every tenth means 1/3 stop of reduction.

DENSITY TABLE
Density ND Factor
f-Stop Reduction
0.1 1/3 stop
0.2 2/3 stop
0.3 ND2 1 stop
0.4 1 1/3 stop
0.5 1 2/3 stop
0.6 ND4 2 stop
0.7 2 1/3 stop
0.8 2 2/3 stop
0.9 ND8 3 stop
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