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Product Announcement

Knight Optical’s Metallic Neutral Density (ND) Filters for Photographic Applications

27 Nov 2021

Known for their ability to avoid possible heating issues usually associated with absorptive filters, Metallic Neutral Density (ND) Filters attenuate light by reflection. In photographic applications, this feature is hugely beneficial for photographers seeking to reduce the amount of light entering a camera lens. 

Alongside their use in a variety of diverse applications, Knight Optical’s Metallic ND Filters are regularly specified for photography applications; allowing photographers more flexibility with their setups to achieve desired effects. 

Our high-quality Metallic ND Filters are typically manufactured in Borosilicate or UV Fused Silica and are available from stock or as custom-made components. By using Knight Optical’s customised service, you can specify the shape and size of your optics to meet the specific requirements of your application. What’s more, we also offer customised optical coatings to enhance the operability of your application and protect devices operating within harsh environments. 

Typical specs: 

Shapes: Circular filters, square filters 

Dimensional tolerances: +/- 0.1mm 

Parallelism: < 1 arcminute 

Flatness: < 5(1) @632.8nm 

Surface quality: <40-20 Scratch/Dig

First-Class Quality 

Quality is the driving force behind Knight Optical, and to ensure you profit from high-precision optics, we take the utmost care to ensure every component accurately meets your specifications. Offering unparalleled service, Knight Optical undertakes a full inspection of your optics from our ISO 9001:2015-certified, state-of-the-art Metrology Laboratory, followed by a meticulous visual examination by our dedicated QA department. 

To discover how we can enhance your supply chain experience and to learn more about our custom-made Metallic ND Filters, contact a member of our technical sales team today. 

UK, Europe, Asia & RoW: E-mail info@knightoptical.co.uk 

Tel +44 (0)1622 859444

USA & Canada: E-mail usasales@knightoptical.com 

Tel +001 401-583-7846 

Knight Optical Ltd
Roebuck Business Park
ME17 1AB
United Kingdom
Tel: 44 (0)1622 859444
Fax: 44 (0)1622 859 555
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