Thanks for the comments Trevor. I did take a look at the colimation before I began imaging with a quick star test and it looked ok although I probably didn't have enough magnification at that time to know for sure.
I haven't had much success at blowing up 2x before but there are so many variables in this game. My best attempts at Jupiter were using 2x with spacer between the barlow and the camera. Might give that another try.
Peter
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