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 |
| FNG2584 | 0.076 | 84%@565nm | 25 | Absorptive Glass ND Filter |
US$23.21
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| FNG2572 | 0.13 | 72.4-74.4%@565nm | 25 | 0.95 | Absorptive Glass ND Filter |
US$23.21
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| FNG2571 | 0.15 | 71%@565nm | 25 | 1.2 | Absorptive Glass ND Filter |
US$23.21
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| FNG2554 | 0.26 | 54.6-56.6%@565nm | 26 | 2.15 | Absorptive Glass ND Filter |
US$23.21
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| FNG2552 | 0.3 | 52 | 25 | 1 | Absorptive Glass ND Filter |
US$23.21
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| 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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