Hi,
I took the attached image with an unmodded 400D, so basically they are fine astro cameras, even better when modded.
However if i was just starting out i would look for a modded 350D. This will give a far better red response on nebulas. Also it will work with all the laptop type focussing tools, like DSLR focus in which case who cares about live view. Unfortunately this software does not work with 400, 450D's.
If you are patient you should be able to get a modded 350D for around 600 to 650 AUD, less than the price of a 400D.
A modded 350D will take far better astro photos than an unmodded 400D or 450D.
Paul
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