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With Skywatcher Newts [including Dobs] you do not require a T-adaptor.
You unscrew the barrel on the focuser that 1.25" eyepieces slide into, and the T ring screws directly onto the exposed male thread for prime focus work. The weight of a DSLR is not a real problem, as a simple counterweight can be devised. My 30mm 2" eyepiece is heavier than my Canon 1100D, and the load is even heavier when I add the 1.5x barlow.
raymo
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