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Schneider’s neutral density filters attenuate light by absorption. We are able to offer a wide range of filters with different attenuation levels by carefully controlling the thickness of the filter material. The transmission variations over the visible wavelength range are very small to avoid effects on color balance.
In imaging applications ND filters are used to adjust the intensity to an appropriate level to avoid camera overexposure. If you use a filter instead of stopping down the iris, you will not affect other imaging parameters such as depth of field and diffraction limitations.
Technical
Specifications 1)
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| Filter Type |
101 |
102 |
103 |
106 |
110 |
Wavelength
range |
vsisible |
vsisible |
vsisible |
vsisible |
vsisible |
Optical
density |
0.3 |
0.6 |
0.9 |
1.8 |
3.0 |
| Transmission 2) |
50% |
25% |
12.5% |
1.6% |
0.1% |
| Surface 3) |
5/2 x 0.16 |
5/2 x 0.16 |
5/2 x 0.16 |
5/2 x 0.16 |
5/2 x 0.16 |
Wavefront
distortion
4) |
1 λ |
1 λ |
1 λ |
1 λ |
1 λ |
| Parallelism |
1 arc minute |
1 arc minute |
1 arc minute |
1 arc minute |
1 arc minute |
Diameter
tolerance |
+ 0 - 0.3 mm |
+ 0 - 0.3 mm |
+ 0 - 0.3 mm |
+ 0 - 0.3 mm |
+ 0 - 0.3 mm |
| Thickness |
2.0 ± 0.1 mm |
2.3 ± 0.1 mm |
1.65 ± 0.1 mm |
1.8 ± 0.1 mm |
2.15 ± 0.1 mm |
1) Specifications for unmounted and uncoated versions
2) Average over 400-700 nm
3) Surface specification according to ISO 10110,
quality usually similar to
 MIL
80-50 scratch-dig or better
4) Per 30 mm at 633 nm |
Key Features
- Low reflections
- Wide range of attenuation levels up to 1:1,000,000
- Combine filters to individual levels by stacking
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Applications
- Machine Vision and other imaging applications
- Scientific & research measurements
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