I love my wee 550D for daytime stuff (+ HD video is very cool) but my 40D is now the dedicated Astro cam - that said it's a very different beast from its stock counterpart...cooled and modded by Central DS. When I got this done I convinced myself that it would easily double as a day/astro DSLR.
The added weight/bulk put pay to this. I'm very happy with the Astro 40D performance, but in retrospect an OSC CCD would have probably been the wiser option.
Cheers
Doug
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