Our stepped filters have an ND coating on the front with no coating on the back. They are coated in various steps; please see the chart below for step and transmission details. The Optical Density (OD) is defined as follows:
D = log10(1/T), or T = 10-D
Steps for coating -- 1: 0.04, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 1.0
Steps for coating -- 3: 0.04, 0.1, 0.2, 0.3, 0.4, 0.5, 1.0, 2.0, 3.0, 4.0
Steps for coating -- 4: 0.04, 0.2, 0.4, 0.6, 0.8, 1.0, 2.0, 3.0
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