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 |
| FNG1025 pdf | 1 | 10 | 25 | 3.9 | NG5 | Absorptive Glass ND Filter |
US$32.80
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| FNG1013 pdf | 1 | 10 | 12.5 | 3.9 | NG5 | Absorptive Glass ND Filter |
US$20.85
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| FNG0850 pdf | 0.8 | 16 | 50 | 50 | 3.1 | NG5 | Absorptive Glass ND Filter |
US$67.00
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| FNG0825 pdf | 0.8 | 16 | 25 | 3.1 | NG5 | Absorptive Glass ND Filter |
US$32.80
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| FNG0813 pdf | 0.8 | 16 | 12.5 | 3.1 | NG5 | Absorptive Glass ND Filter |
US$20.85
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| FNG0650 pdf | 0.6 | 25 | 50 | 50 | 2.3 | NG5 | Absorptive Glass ND Filter |
US$67.00
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| FNG0625 pdf | 0.6 | 25 | 25 | 2.3 | NG5 | Absorptive Glass ND Filter |
US$32.80
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| FNG0613 pdf | 0.6 | 25 | 12.5 | 2.3 | NG5 | Absorptive Glass ND Filter |
US$20.85
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| FNG0550 pdf | 0.5 | 32 | 50 | 50 | 4.1 | NG11 | Absorptive Glass ND Filter |
US$67.00
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| FNG0525 pdf | 0.5 | 32 | 25 | 4.1 | NG11 | Absorptive Glass ND Filter |
US$32.80
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