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 |
| FNG2550 pdf | 2.5 | 0.32 | 50 | 50 | 2.4 | NG3 | Absorptive Glass ND Filter |
US$67.00
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| FNG2525 pdf | 2.5 | 0.32 | 25 | 2.4 | NG3 | Absorptive Glass ND Filter |
US$32.80
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| FNG2513 pdf | 2.5 | 0.32 | 12.5 | 2.4 | NG3 | Absorptive Glass ND Filter |
US$20.85
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| FNG2050 pdf | 2 | 1 | 50 | 50 | 3.8 | NG4 | Absorptive Glass ND Filter |
US$67.00
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| FNG2025 pdf | 2 | 1 | 25 | 3.8 | NG4 | Absorptive Glass ND Filter |
US$32.80
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| FNG2013 pdf | 2 | 1 | 12.5 | 3.8 | NG4 | Absorptive Glass ND Filter |
US$20.85
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| FNG1550 pdf | 1.5 | 3.2 | 50 | 50 | 2.9 | NG4 | Absorptive Glass ND Filter |
US$67.00
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| FNG1525 pdf | 1.5 | 3.2 | 25 | 2.9 | NG4 | Absorptive Glass ND Filter |
US$32.80
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| FNG1513 pdf | 1.5 | 3.2 | 12.5 | 2.9 | NG4 | Absorptive Glass ND Filter |
US$20.85
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| FNG1050 pdf | 1 | 10 | 50 | 50 | 3.9 | NG5 | Absorptive Glass ND Filter |
US$67.00
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