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Hi Peter.
You'd best find out if you can reach focus with your 400D and 10" newt. You may need a low profile focuser, or to move the mirror up the tube to allow enough in-focus to bring it to focus.
Apart from that, yes - the T-Ring and camera adapter will allow you to insert it into the focuser.
As for shutter release, you're best off controlling it from a computer (laptop) if you can, via software (and cables connected to the camera). It's much easier and the images are downloaded directly to the computer.
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