Frequently Asked Questions

Knight Optical offers stock absorptive ND filters in 12.5mm and 25mm diameters, and 50x50mm squares manufactured from high quality glass.

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

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

Neutral density filters can be cut down or edged to special shapes and sizes at short notice.

Neutral density filters can be mounted or unmounted.

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