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Bandpass Filters
UV-VIS-NIR- Infrared
- Surplus
- Neutral Density Filters
- Heat Control Filters
- Astronomy Filters
- Dichroic Filters
- Edge Filters
- VIS-NIR
- Infrared
- Accessories
- Filter Wheels
- Temperature Controllers
- Specialized Coatings
- Spectrophometer Calibration Filters
- Filter Glass
- Optical Fabrication and Polishing
- Epoxy
- Surplus Equipment
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| Andover Corporation is now offering UBVRI filters as standard items. These filters are used to filter out and measure specific bands of light which are emitted by astronomical objects. Two types are offered: the Johnson/Bessel and the Kron/Cousins. The Johnson/Bessell type is better suited for use with a photomultiplier tube whereas the Kron/Cousins type is better suited for use with a Silicon CCD. Both filter sets work very well but it is important to establish the type of measuring system you are going to utilize before purchasing any sets. Both filter types utilize the same U, B & V filters. The R & I filters for each type are different; they are better matched to the response of the detector being used. Refocusing, is always a problem when changing filters, Andover has minimized this problem by grinding and polishing all filters to a very precisely controlled thickness. The UBVRI filters are available in a range of standard and custom sizes. With the exception of two sizes which are mounted in threaded rings, all other sizes are unmounted. Contact Andover Technical Sales if you have any questions or require a quotation for a custom size or mounting. |
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| Custom UBVRI filters, manufactured to your specifications, are also available. Contact our technical sales department for a quotation. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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