Quote:
Originally Posted by mbaddah
. Stars were nice round rings  |
When looking for signs of pinched optics it might not show up unless you're focused down to a small number of rings. Watch the shape as they collapse down as you rack through focus and out the other side. If they stay round all the way then thats fine. Any distortion of shape that flips orientation on the other side of focus may be indicative of pinched optics or astigmatism.