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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.

FNG0550 - Absorptive Glass Neutral Density Filters

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Specifications

Attenuator Type: Absorptive
Shape: Square
Size: 50 mm
Optical Density: 0.5

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

How are Glass ND Filters different from Gelatine ND Filters?
Glass ND Filters are more robust and tend to have more uniform absorption characteristics than Gelatine ND Filters. 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 Absorptive Glass Neutral Density Filters be customized?
Yes, Knight Optical offers an extensive custom optic service and can supply ND filters cut to sizes and shapes to fit individual application and mount filters where applicable.
What is the purpose of a Glass Neutral Density filter?
Glass Neutral Density filters attenuate light by absorption and are typically used in applications such as spectroscopy, machine vision, ellipsometry, and photography.
What are the mounting options available for the Absorptive Glass Neutral Density Filters?
The Absorptive Glass Neutral Density Filters can be mounted or unmounted. They can also be cut down or edged to special shapes and sizes at short notice.
What is the range of Optical density for the Absorptive Glass Neutral Density Filters?
The Absorptive Glass Neutral Density 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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