Frequently Asked Questions

Neutral density filters can be custom made with dimensions ranging from 5mm to 300mm+ and optical density ranging from 0.1 to 4.0. They can also be coated with options from antireflective to anti-scratch and mounted or unmounted.

Gelatin ND filters are the cheapest but tend to have more fluctuation with wavelength and a narrower wavelength range than glass ND filters and metallic types.

Gelatine neutral density filters work by absorption so care must be taken to avoid overheating which can lead to damage to the filter.

Neutral density filters are used in applications such as spectroscopy, machine vision, ellipsometry and photography.

A neutral density filter attenuates light by a constant amount that is independent of the wavelength.

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