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Hi Kirkus,
For widefield work, piggy backing your new 400D with a camera lense on your mount you should be fine doing unguided as long as you stick with short focal length lenses like 24mm, 50mm and maybe 135mm for 5 min or more if you are well polar aligned but through your scope you most likely be limited to like 30 sec or a minute unguided. Periodic errors etc in your drive train on your mount will most likely cause star trailing and movement as everything gets magnified through the scope with only the very best and most expensive mounts being able to do longer unguided exposures....
Most of all have fun with your new toy and I would recommend doing a little widefield work with your standard lense first then when you have got the hang of that, do some prime focus stuff.
cheers Gary
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