I start this as a new topic not to confuse the other on focusing. I've been thinking lately a lot about SNR and focusing - and I have a strong feeling that part of my intermittent challenges with focus have to do with low SNR. But: I can not see the SNR value of the chosen star in the focus module - or can I? If not, is there a way to show it?
The SNR is part of statistics provided by the FITS viewer, so I suppose that could be displayed. The SNR could also be used to control the exposure for focus, yes, just like phd2 is supposed to do with its automatic exposure feature.