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You won't get your DSLR to focus in the dob without moving the mirror up the tube, or making a very low profile focuser. You just can't get enough in-focus. It's been discussed a few times in the past, so do a search.
You're best off just using the camera and lens on a tripod to start with, or simply take some afocal shots of the moon and planets. I honestly wouldn't try and do any DSO photography with your dob, especially without tracking. It's a path that leads straight to frustration and disappointment.
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