Duncan,
I can't comment from personal experience but I do recall this
same topic being discussed before......vaguely !
Not sure if it was this thread:
http://www.iceinspace.com.au/forum/s...ght=450D+1000D
or another.....
http://www.iceinspace.com.au/forum/s...ght=450D+1000D
but I think the 450 got more praise due to sensitivity over the 1000D
when talking astro work.
Please anyone correct me if I'm wrong!
Steve