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 |
| 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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| FNG0125 pdf | 0.1 | 79 | 25 | 0.6 | NG11 | Absorptive Glass ND Filter |
US$32.80
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| FNG0113 pdf | 0.1 | 79 | 12.5 | 0.6 | NG11 | Absorptive Glass ND Filter |
US$20.85
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