[Weltevreden SA (Dana)]

Most professional papers cite photometric CMD colour relationships using the Johnson UBVRI notation instead of the Strömgren uvby system. Why? As I understand it, the Strömgren system was devised specifically for photometric precision, while the Johnson system originated in early colour TV experiments and the broad bandwidths used at the time. The relatively few papers that cite the Strömgren system in their data reduction sections are usually devoted to narrow-band spectroscopy of some sort, usually ugrix. The bandwidth spreads can be very different, e.g. V=100nm versus b=20nm, or I=150nm versus BetaN=3nm. I'm curious how the seemingly clunky UBVRI system managed to hold on. =Dana in SA