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Hi,
Not sure about an 8" Dob, but I had a 10" Dob and it just did not have enough in foucs for a 400D (even with a low profile focusser), or any DSLR from what I have since read. The only option is to move the mirror up the tube and I am sure one of the more experienced members will give you some details on this.
As far as the 400D goes, excellent camera in my opinion. I have since moved on to a modded 20D (and kept the 400D for terrestrial work) and it also an excellent camera. It might be worth considering waiting for the 450D to be released as it has live view which is extremely handy for focussing the wonders of the night sky.
Good luck with your choices and above all clear skies.
Regards
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