Hi
I pushed my EOS 300D harder than ever, taking a single 1/2 hour ISO 200 shot of 4945 with the 10 inch F5.6 scope. Took a 2nd one that I had to stop at about 20 mins because the end of the scope was going to run into one of the mount legs. Heres the final image
http://www.users.on.net/~josiah/temp/4945small.jpg
A bigger version is here
http://www.users.on.net/~josiah/temp/4945deepsmall.jpg
Despite the very long exposures for an uncooled camera, no dark subtraction was done.