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Green and blue filters are band-pass filters with a specific spectral transmission characteristic that transmits light which is perceived by
the human eye as the corresponding color. These filters use absorptive glasses, that are robust, cost-effective and insensitive to angle of incidence.
In machine vision, one of their typical applications, they are used in front of a lens on a monochrome CCD or CMOS camera to improve image contract. The appropriate type of filter has to be selected with respect to the color of the object and the type and/or color of the illumination. These filters are available unmounted or in mounts with all common thread sizes.
Technical
Specifications 1)
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| Filter Type |
060
yellow-green |
061
green |
080
light blue |
081
blue |
| Surface |
5/2 x 0.16 2) |
5/2 x 0.16 2) |
5/2 x 0.16 2) |
5/2 x 0.16 2) |
| Wavefront distortion
3) |
1 λ |
1 λ |
1 λ |
1 λ |
| Parallelism |
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 |
| Thickness |
2.0 ± 0.2 mm |
2.0 ± 0.2 mm |
2.0 ± 0.2 mm |
2.0 ± 0.2 mm |
1) Specifications for unmounted and uncoated versions
2) Surface specification according to ISO 10110,
quality usually similar to
 MIL
80-50 scratch-dig or better
3) Per 30 mm at 633 nm |
Key Features
- Insensitive to angle of incidence
- Available in mounts with all common thread sizes
- Absence of vignetting due to large clear aperture
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Applications
- Machine Vision and other imaging applications
- Scientific & research measurements
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