Bandpass filter suitable from f/15 to f/1.8
Filters for scientific photometry: The UBVRI system was developed in the 1950s for the McDonald Observatory 0.9 m telescope and consisted first of a Johnson UBV filter set, later becoming cousins with the R and I filters in the red Expanded range of spectrum. The Johnson and Cousins extended UBVRI system filters include:
Bessel filters for the digital age: In 1990, MS Bessel dealt with the subject in order to find a filter combination for the CCD cameras, which were becoming increasingly common at the time. These Bessel UBVRI filters are still standard today and are also the most widely used in amateur circles such as the AAVSO. In particular, the V filter has proven itself as an inexpensive entry into photometry: it roughly corresponds to the visual brightness; since only one measured value is used, this is ideal for getting to know the techniques.
The filters of this series are characterized by:
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