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Hi Allan,
how are you coupling the DSLR to the focuser of your Scope?
If you are coupling via nosepiece and eypieceholder then it wont work. T-ring+adaptor go straight on the focuser, the eyepieceholder needs to be removed.
If that doesn´t work but only need a few millimeter more inwards travel then try using a low profile focuser. The focuser change is easier to perform as the tube cutting.
cheers
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