|
Certainly corrector is not at the right distance. The stars in the corners are out of focus while the stars in the center of the field are focused. So that needs sorting out with some correct spacing.
Also there is apparent field rotation in the corners. If you look at each corner the stars are rotating in the same direction. That means your PA needs looking at just a little more or you have some slop or movement with the camera. Also just check the way you align your subs too. This could be contributing to make the effect of PA more evident.
Get these sorted and you are well on your way.
|