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I'm using the Baader MPCC mkIII, the coma was the same in all 4 corners. I took it to I need to get the spacing right.
At the moment I'm pretty sure it is 55mm to senor and as like yourself may need to more it a fraction.
Edit: I checked and had back focus of 58mm which I'm guessing is the issue for my comas
Last edited by Karlz; 06-03-2021 at 04:19 PM.
Reason: Comas had to be comas
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