I recently bought a RASA 8 and I operate it with a ZWO 2600MC + 7.5mm spacer. And - like 99% of all Rasa Users - I see
unsharp stars in my right upper corner - even worse at the very right - and still at the bottomo right corner.
I am trying to elaborate whether this is back-focus or Tilt. And for this, I was told ASTAP is one of the best tools.
When I run Monitor - and press F5 and F4 I get this result
Question: Is there anyone who can give me some introduction, how to proceed best?