Andover Corporation offers UBVRI filters as standard items. These filters are used to filter out and measure specific bands of light that 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 very precisely controlled thicknesses.

The UBVRI filters are available in a range of standard and custom sizes. Contact Andover Technical Sales if you have any questions or require a quotation for a custom size or mounting.

• Options for professionals and amateurs alike
• Ideal for photometric calibration
• Isolate and measure large specific bands of light emitted by astrological objects

COMMON APPLICATIONS