I have noticed that PHD2 (with recent versions, currently using ver 2.6) is guiding on really really faint stars. It is insisting on using a star that is not saturated. This makes complete sense from the point of view that it can calculate a better centroid using a non-saturated star. However, this seems to be causing a real problem for me, and seems to be very different from earlier versions of PHD2 (maybe).
The problem is the guide star is so faint, it frequently loses track of the star, which forces SGP to restart the current image after it reacquires the star.
How is this different from prior versions of PHD2? Well, there is a complicating factor here for me. I recently changed guide cameras from a Lodestar X2 (8.6 micron pixels) to a ZWO ASI120MM (3.75 micron pixels). Also I think my focus with the ZWO is better than I ever had with the Lodestar X2. Although the Lodestar is much more sensitive than the ZWO, i am getting many more pinpoint stars than I ever did with the Lodestar.
So I have only noticed what seems to me to be a change in PHD2s choice of guide stars since shifting to the ZWO.
In any case, how can I get PHD2 to choose more saturated stars so that it does not keep losing track of the guide star.
Or can PHD2 be instructed to automatically shift to a new guide star, if it loses track of the current one? Hopefully without notifying SGP that it has halted guiding.