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Neutral Density Filters
About Knight Optical- 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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