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The T ring will not generally screw directly on to the back of the tube, there will be an adapter/spacer in between. I am not sure what thread size the C11 uses though.
On my C925 there is a spacer/adapter which includes a tube nut which slides down over the spacer to fix that to the back of the scope, then the T ring screws to the other end of the adapter and the camera obviously attaches there.
The adapter both converts the SCT thread to the T ring thread and sets up the basic spacing to put the camera sensor around the focal plane.
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