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 |
| 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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| FNM00325 pdf | 25 | 2 | Borosilicate | Uncoated Borosilicate |
US$30.58
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| FNG6085 | 0.2 | 60 | 7 | 2 | Absorptive Glass ND Filter |
US$8.90
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| FNG4050 pdf | 4 | 0.01 | 50 | 50 | 3.9 | NG3 | Absorptive Glass ND Filter |
US$67.00
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| FNG4025 pdf | 4 | 0.01 | 25 | 3.9 | NG3 | Absorptive Glass ND Filter |
US$32.80
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| FNG4013 pdf | 4 | 0.01 | 12.5 | 3.9 | NG3 | Absorptive Glass ND Filter |
US$20.85
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