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Really there is only a few telescopes designed for astrophotography. Your Dob isn't one of them. You will need to measure and move your mirror up the tube by quite a bit to allow a DSLR to reach focus. This is not as dificult as it sounds. Several articles are available which spell out the process.
The other option is of course an expensive one and that is to purchase a good APO refractor or a dedicated Astrograph. The Dob will work well but you will need to make the modd and you will require a Comma Corrector like a Baader MPCC or similar.
I made this modd to a 12" dobb some years ago, it only took an hour to complete, was quite simple and worked a treat.
Good luck.
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