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Product Announcement

Knight Optical’s Colour Glass Filters for ANPR Camera Systems

04 Sep 2021

Knight Optical’s high-precision Colour Glass Filters enable ANPR cameras to capture vehicles’ number plates with ultimate accuracy. Known for their selective wavelength abilities, our Colour Glass Filters are commonly used within ANPR systems for 695nm, 740nm, 810nm, 850nm, 910nm and 940nm wavelengths.

Stock Colour Glass Filters

We stock a vast range of high-quality Colour Glass Filters, ready for next-day global dispatch. Our stock range includes Longpass, Shortpass, Bandpass and Mounted options; available in 25mm diameters, and x 3mm-thick 50x50mm squares. 

Custom-Made Colour Glass Filters

Projects requiring tailored optical solutions can benefit from our custom-made Colour Glass Filters, in Longpass, Shortpass, Bandpass and Mounted varieties. This option allows you to specify millimetre-perfect dimensions, shapes, protective coatings and project-specific tolerances, ideally suited to your requirements. Custom-made Colour Glass Filters are also available with specific band-blocking coatings to optimise your wavelength of choice, and as alternative thickness substrates. 

Typical Specs:

Material: Colour Glass

Diameter: +0.0 / -0.20 mm

Length/Width: ± 0.20 mm

Thickness: ± 0.20 mm

Surface Quality: <60-40 scratch/dig

Parallelism: <3 arcminutes


  • Wavelength cut-on listed in table is transition cut-on wavelength (T=Tmax/2)
  • Wavelength cut-off (listed in the table) is transition cut-off wavelength (T=Tmax/2)
  • Wavelength peak is centre wavelength (specific to Bandpass Filters). 

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 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 stock and custom-made Colour Glass 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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