Absorptive glass neutral density filters

Glass Neutral Density filters attenuate light by absorption just like the gelatine neutral density filters. Glass ND Filters are more robust and tend to have more uniform absorption characteristics. They also attenuate by absorption and so care must be taken to avoid overheating. Attenuation is achieved by polishing glass to the correct thickness.

Knight Optical offers stock absorptive ND filters in 12.5mm and 25mm diameters, and 50x50mm squares manufactured from high quality glass. Each filter is available with blocking between 0.1 and 4.0 OD and are available to purchase direct from this page

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Knight Optical has been providing quality precision optical components, sub-assemblies and mechanics to the optics market for over 26 years. Our highly qualified and experienced workforce enables us to offer custom made solutions, in virtually any shape and size. Get in touch with our technical sales team for a quotation today.

We also stock over 3000 optical components, in a variety of specifications including:

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