Neutral density filters attenuate light by a constant amount that is, to first order, independent of the wavelength neutral density filters are designed to equally reduce the transmission over a specified spectrum, either by absorption or reflection. Knight Optical stock several ranges for your specific application.
| Name | Density @ 546nm | Transmission (%) @ 546nm | Diameter (mm) | Length (mm) | Width (mm) | Thickness (mm) | Material/Equivalent | Type | Price | Buy |
| FNP0350 pdf | 0.3 | 50 | 50 | 50 | 0.1 | Wratten 2 | ND No. 96 Filter |
US$59.49
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| FNP0250 pdf | 0.2 | 63 | 50 | 50 | 0.1 | Wratten 2 | ND No. 96 Filter |
US$59.49
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| FNP0150 | 0.1 | 79 | 50 | 50 | 0.1 | Wratten 2 | ND No. 96 Filter |
US$59.49
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| FNM3050 pdf | 50 | 50 | 2 | Borosilicate | Metallic ND Filter |
US$61.30
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| FNM3025 pdf | 25 | 2 | Borosilicate | Metallic ND Filter |
US$39.34
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| FNM2050 pdf | 50 | 50 | 2 | Borosilicate | Metallic ND Filter |
US$61.30
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| FNM2025 pdf | 25 | 2 | Borosilicate | Metallic ND Filter |
US$39.34
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| FNM1550 pdf | 50 | 50 | 2 | Borosilicate | Metallic ND Filter |
US$61.30
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| FNM1525 pdf | 25 | 2 | Borosilicate | Metallic ND Filter |
US$39.34
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| FNM1050 pdf | 50 | 50 | 2 | Borosilicate | Metallic ND Filter |
US$61.30
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