Excellent image Mark ... well done!
I have a 90mm Mak on a basic alt/az (iOptron cube).
I regularly play at imaging with a small CCD webcam (Celestron NexImage) but I've been toying with the idea of using one of my Canon DSLR bodies with the scope.
I'm interested to know how you've set things up ... in particular how you attached your 550D.
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