Yep, you can definitely attach a Canon DSLR to the FlexTube dobs. On my 10" model, I just have to retract the secondary mirror a few centimeters (ie don't extend the secondary all the way until the lock position) for prime focus. The coma's pretty bad on a full frame chip, though.
If you use a barlow/extender, I think you may be able to reach focus with the secondary in the normal visual position.
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