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Knight Optical
Roebuck Business Park
Harrietsham, Kent ME17 1AB

Full Company Details
Phone: 44 1622 859444
Fax: 44 1622 859555
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Knight Optical

Neutral Density Filters
  • Type: Filters
  • Diameter / Dimension: 5mm - 300mm
  • Filter Category: Neutral Density Filter
  • Applications: Astronomy, Biomedical/Medical, Industrial, Scientific Research, Other
  • Thickness - Gelatine: +/-0.05
  • Thickness - Glass: +/-0.2
  • Thickness - Metallic: < 10(5)
  • Optical Density: 0.1 to 4.0

Neutral density filters attenuate light by a constant amount that is, to first order, independent of the wavelength. Gelatin ND filters are the cheapest but tend to have more fluctuation with wavelength and a narrower wavelength range than glass ND filters and metallic types. Gelatine ND filters work by absorption so care must be taken to avoid overheating which can lead to damage.
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