Optical Filters

Optical Instruments
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UBVRcIc filters (Conventional)

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. Mike Bessell at
RSAA in Australia.

figure U, B, V, Rc, Ic Filters