Hello again. I have a celstron C14 SCT and 0.8x reducer with a Starizona feather/ microtouch. I use autofocus at the beginning of my sessions to get a good focus. I focus manually first so the autofocus routine has something good to work with. I’m getting about a 1:5 success: failure ratio. Sometimes I get a nice u or v curve and a 90% + confidence indication and other times it repeatedly tries to focus, can’t get a good result and returns to the original focus point. Most of the time past midnight I’m not in attendance so can’t intervene. The successes are usually at the start of an imaging session, when I click ‘run’ shortly after I platesolve in a random area of sky. The failures are when I’m not in attendance - I’ve set the system to autofocus every 90 minutes, so the failures usually have a galaxy or two in the image, not sure if that affects the algorithm.
Just for an idea of scale, if I image M81 with this setup it more or less fills the frame. I’m mainly trying these days to image some of the Arp galaxies and these are usually much smaller, perhaps taking up 20% ish of the FOV (for the larger Arps).
I’m using 7 points and 125 steps per point which gets me donut stars for the first point. I also crop the image by about 15% to avoid any odd shaped stars at the FOV edge.
Any suggestions on how to improve things would be wlecome.