Hi Matthew,
yes, grab a shortish shot of something that fills the frame, if Omega Cent does, then do that. If it shows stars it will show coma.
Attached is a JPEG quick and dirty from the 8" I put together. It was a test to see if I needed the Baader MPCC. I think the answer is self-explanatory, LOL.
Depending on the scope you are using in your case maybe try this. I think it would have been perhaps a 30 second shot.
Gary
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