Quote:
Originally Posted by Craig_
Funnily enough if I focus using HFD measurements and go back to Rigil Kent, and put the mask back on, the spikes are even less aligned than that second image. Unfortunately I didn't screenshot that.
It's a mask made of thin metal, so I assume laser cut.
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So you are using the two focusing methods in two different orientations of the scope (different parts of the sky). Are you sure there's nothing in the optical train that can shift/move when you go from one part of the sky to the other?