Fewer visual observers are recording data on long period variables. There was a request to do CCD Photometry on these stars to allow transformation of the historical visual data to current CCD data.
Most recent CCD observers have chosen the B and V or V and I bandpasses for this task. Is there significant benefit to do transformed 4 filter photometry on these stars? VPHOT makes it easy to measure and transform images from two filters but it is quite clumbersome to do 4 filters.
If it is worth doing 4 filters would BV combined with a subset of Sloan filters be better than BVRI?