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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. In addition to our stock absorptive glass ND filters, Knight Optical also offers an extensive custom optic service thanks to our many years of experience in the industry. We can supply ND filters cut to sizes and shapes to fit individual application and mount filters where applicable. READ PDF FOR FULL SPECIFICATION

Here at Knight Optical, we understand that there is no one size fits all for your optical component specifications. That is why – as well as edging down our stock optics – we also offer our entire range as custom-made components. This bespoke option is popular across a variety of sectors such as defence and aerospace, medical and research as well as engineering and manufacturing industries; to name a few. By opting for our customised service, not only will you be able to choose the material, millimetre-perfect dimensions and thicknesses best suited to your application, but you will also be able to pick appropriate optical coatings to protect or enhance your device's operability. If you would like to discuss your optical requirements with a member of our team or to find out more about our custom-made optics, please get in touch on +44 (0)1622 859444, choose option One. Alternatively, click here to view our full range of custom-made optics.

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