As the others have mentioned, you almost certainly won't get focus with the dSLR. However, there is one way around this, use a barlow. That will allow you to reach focus (you don't need an eyepiece!). however, the downside is that with a Barlow you won't get the whole moon in your view and pictures of bits of the moon are less exciting on the whole.
You need a t-ring for your camera, available from myAstroshop from $17, and a prime focus adaptor to fit your focuser, again not that much and available from myastroshop and elsewhere.
A dob is very limiting in this respect and the advantages of a dSLR (long single exposures, high resolution) aren't taken advantage of. All in all it's not really worth the effort (and I have tried it). Use the dSLR to take widefield pics of the stars on a tripod instead!
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