I understand that BSM_Berry4 no longer exists, having had its camera replaced by a different model.
So, how do I color-transform BSM_Berry4’s remaining data?
I usually do Time Series analysis over images from several dates with an ensemble of comp stars. With a single date, I can’t do Time Series.
A great many of the images I have were obtained using three filters, so I cannot perform Two-Color transform either. So, what can be done to reduce the data?