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Description

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 are able to supply ND filters cut to sizes and shapes to fit individual application and mount filters where applicable.

FNG0250 - Aborptive Glass Neutral Density Filters

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Specifications

Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 0.2

Got questions about specs? Use the inquiry form to ask.

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Features

  • Mounting of diameters and squares.
  • Antireflective coatings can be applied to one or both faces for improved transmission.
  • Cutting down or edged to special shapes and sizes at short notice..
  • Available in sets, supplied in a wooden storage box for research and laboratory use.

Applications

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

Frequently Asked Questions

What is the difference between glass ND filters and gelatine ND 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. Gelatine ND filters are low cost but tend to have more fluctuation with wavelength and a narrower wavelength range than glass ND filters and metallic types.
Can the filters be customized to fit individual applications?
Yes, Knight Optical offers an extensive custom optic service and can supply ND filters cut to sizes and shapes to fit individual applications and mount filters where applicable.
What are the dimensions and thicknesses of the neutral density filters?
The neutral density filters can be cut to dimensions ranging from 5mm to 300mm+ with thicknesses of Gelatine +/-0.05, Glass +/-0.2, and Metallic < 10(5).
What applications are neutral density filters used for?
Neutral density filters are used in applications such as spectroscopy, machine vision, ellipsometry, and photography.
What is the optical density range of the filters?
The filters are available with blocking between 0.1 and 4.0 OD.

Got more questions? Use the inquiry form to ask the supplier directly.

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