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 |
| FNM0450 pdf | 50 | 50 | 2 | Borosilicate | Metallic ND Filter |
US$61.30
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| FNM0425 pdf | 25 | 2 | Borosilicate | Metallic ND Filter |
US$39.34
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| FNM0350 pdf | 50 | 50 | 2 | Borosilicate | Metallic ND Filter |
US$61.30
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| FNM0325 pdf | 25 | 2 | Borosilicate | Metallic ND Filter |
US$39.34
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| FNM0313 pdf | 12.5 | 2 | Borosilicate | Metallic ND Filter |
US$26.41
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| FNM0250 pdf | 50 | 50 | 2 | Borosilicate | Metallic ND Filter |
US$61.30
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| FNM0225 pdf | 25 | 2 | Borosilicate | Metallic ND Filter |
US$39.34
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| FNM0150 pdf | 50 | 50 | 2 | Borosilicate | Metallic ND Filter |
US$61.30
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| FNM0125 pdf | 25 | 2 | Borosilicate | Metallic ND Filter |
US$39.34
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| FNM00350 pdf | 50 | 50 | 2 | Borosilicate | Uncoated Borosilicate |
US$46.29
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