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Individual Neutral Density Filter
Neutral Density Filter reduces the brightness of an image without changing the color of the scene. It allows all wavelengths to pass through equally. Neutral density filters are categorized by their optical density (D) which is defined as the logarithm to the base 10 of the reciprocal of the transmittance (T): T=10-D
Application:
Imaging System
Measuring Instrument
Specification:
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Material |
Optical Neutral Density Glass |
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Diameter Tolerance |
+0.0, -0.2 mm |
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Thickness Tolerance |
±0.1 mm |
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Surface Quality |
60-40 scratch and dig |
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Clear Aperture |
>85% |
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Parallelism |
< 3 arc minute |
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Flatness |
2λ per 25 mm @632.8 nm |
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Optical Density Tolerance |
±5% @400-700 nm |
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Protective Bevel |
<0.25 mm x 45° |
Neutral Density Glass Type Filter Standard Products:
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Optical Density |
Transmission (%) |
Thickness (mm) Appr. |
φ20.0 |
φ25.4 |
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Part No. |
Part No. |
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0.1 |
79.4 |
1.35 |
F101 |
F201 |
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0.2 |
63.1 |
3.44 |
F102 |
F202 |
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0.3 |
50.1 |
2.4 |
F103 |
F203 |
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0.4 |
39.8 |
3.31 |
F104 |
F204 |
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0.5 |
31.6 |
1.84 |
F105 |
F205 |
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0.8 |
15.8 |
3.03 |
F106 |
F206 |
Note: Neutral density coating type filter are available upon your request.
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