Optical Filters

Optical Instruments
International Agency
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UBVRcIc filters

Though UBVRcIc photometric system is rather classical in modern astronomy, UBVRcIc filters are still fundamental and important
for some telescopes.
Asahi provides UBVRcIc filters made with specified colored glass combination under the suggestion by Prof. Michael S. Bessell
at RSAA in Australia.

We currently try to develop UBVRcIc filters with "interference coating version" to replace the conventional colored glass combination.
We expect it will improve the image quality drastically in the requirement of larger size especially.

figure U, B, V, Rc, Ic Filters