Quote:
Originally Posted by Robert_T
There is some "slop" in the canon t-ring adaptor that I though might contribute, but I tape this up to keep it steady.
Anything else 
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Why have you got slop in the t-ring adaptor ?
You know there's a little grub screw in there that you should be able to tighten - at least there is in mine.
Check it and see if it's a little loose.