I have a RASA 11 and have not been able to get a flat in focus field from edge to edge. After much tweaking of spacing and adding Baader UFC I now get center and left side in focus and the right side of the full frame sensor has donuts (out of focus),
When I change cameras or spacing and I rotate things on (extensions etc) the enter unit rotates. IS this something they aligned carefully at the factory? Or does it not matter how much it rotates?
I don't feel I should have this much problem with a 3500. scope that is designed for imaging.
I just read a early review and the reviewer said his center lens array rotated and Celestron said to swap the scope for a new one. Is that necessary?