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 |
| FNG0513 pdf | 0.5 | 32 | 12.5 | 4.1 | NG11 | Absorptive Glass ND Filter |
US$20.85
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| FNG0450 pdf | 0.4 | 40 | 50 | 50 | 3.2 | NG11 | Absorptive Glass ND Filter |
US$67.00
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| FNG0425 pdf | 0.4 | 40 | 25 | 3.2 | NG11 | Absorptive Glass ND Filter |
US$32.80
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| FNG0413 pdf | 0.4 | 40 | 12.5 | 3.2 | NG11 | Absorptive Glass ND Filter |
US$20.85
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| FNG0350 pdf | 0.3 | 50 | 50 | 50 | 2.3 | NG11 | Absorptive Glass ND Filter |
US$67.00
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| FNG0325 pdf | 0.3 | 50 | 25 | 2.3 | NG11 | Absorptive Glass ND Filter |
US$32.80
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| FNG0313 pdf | 0.3 | 50 | 12.5 | 2.3 | NG11 | Absorptive Glass ND Filter |
US$20.85
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| FNG0250 pdf | 0.2 | 63 | 50 | 50 | 1.4 | NG11 | Absorptive Glass ND Filter |
US$67.00
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| FNG0225 pdf | 0.2 | 63 | 25 | 1.4 | NG11 | Absorptive Glass ND Filter |
US$32.80
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| FNG0213 pdf | 0.2 | 63 | 12.5 | 1.4 | NG11 | Absorptive Glass ND Filter |
US$20.85
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