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The skywatcher mounts are pretty tough, see if this thing helps. My new FS-60 -> ATIK adapter is at the PO for pickup so I'll post this up to you when I pick it up.
You'll need a t-threaded 2" nose for the telescope side and remove the 1.25" nose off the qhy5 so it screws straight on then you'll want 50mm to sensor so it all comes to focus. Getting everything in focus is a challenge.
Is the 550D a full frame sensor? If it is then the prism in this will show in the image.
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