Absorptive Neutral Density Filters

These neutral density filters consist are made from different types of grey absorptive glass.  These glasses are reasonably neutral over the visible spectrum and will also work in the near infra-red region.    These filters are available in a range of optical densities (specified at 546nm)  as follows:

Optical Density = 0.04, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.3, 1.5, 2.0, 2.5, 3.0, 4.0, 5.0.

Sizes are normally, 12.7 or 25.4mm diameter or 50.8mm square.

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