... There are several different filters in use in the astronomical community today. Most "systems" are comprised of a few (3-8 generally) filters that are related in some manner. For instance, the SDSS u'g'r'i'z' filter set that we use for our survey, or the UBVRI set that was one of the first filter systems developed for photometry.
... Our group has under taken this effort, using essentially the same people, reduction software and selection and observing techinques that were used in the setup of the initial u'g'r'i'z' standard stars in use in the northern hemisphere. In this way, we hope to maintain a consistent approach to entire standard network.
This newsletter contains information on standard star progress in several of the filter systems in use by the astronomical community.