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Thanks for your advice, honestly it was probably a mix of all of the above. I might give the trial of ccd inspector a go and see if I can improve my focus and collimation. I think at the time I was getting an average of 4" for my FWHM. What I'm not sure of is how to get the distance for my coma corrector right. There seems to be conflicting measurements of the qhy8 ccd distance. Is the only way to check the distance is by adding a spacer, refocusing and then checking the FWHM of all the stars and then repeating?
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