Frequently Asked Questions

The features of Glass Neutral Density filters include mounting of diameters and squares, antireflective coatings can be applied to one or both faces for improved transmission, cutting down or edged to special shapes and sizes at short notice, and available in sets, supplied in a wooden storage box for research and laboratory use.

Gelatin ND filters are low cost but tend to have more fluctuation with wavelength and a narrower wavelength range than glass ND filters and metallic types. Glass ND filters are the most common ND filter and attenuate light by absorption just like the gelatine neutral density filters.

The custom capabilities of Neutral Density filters include dimensions ranging from 5mm to 300mm+, thickness of Gelatine +/-0.05, Glass +/-0.2, and Metallic < 10(5), optical density ranging from 0.1 to 4.0, and mounting options of mounted or unmounted.

Glass Neutral Density filters are filters that attenuate light by absorption just like the gelatine neutral density filters.

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

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