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Optical Density(OD)

Optical density (OD) is the attenuation of light that passes through an optical filter. The higher the OD value, the higher the attenuation rate and the protection function. The higher the OD value, the lower the transmittance. The relation between OD and transmittance/attenuation rate is shown as below.


Optical density (OD) attenuation rate transmittance(%)
0 0 100
1 1/10 10
2 1/100 1
3 1/1000 0.1
4 1/10000 0.01
5 1/100000 0.001
6 1/1000000 0.0001