Quote:
Originally Posted by Stephane
Hi Paul, I too am often battling with my Newtonian to get round stars. I was looking at your first image. It looks calibrated. How is your illumination on non-calibrated subs? Central? What telescope and coma corrector are you using? What is your back spacing? Do you use an OAG &/or filter wheel? (Both are notorious for introducing tilt with fast optics)
One thing that helped me was to run an aberration inspector through NINA’s plugin Hocus Focus. It will make a back focus recommendation and tell you what tilt corrections to make.
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Hi Stephane
Yes these things are important too but you should first sought out this other issue first without any correctors in place and once stars look good.
Then with coma corrector in re collimate with good spacing.