Quote:
Originally Posted by chrisc
The DSLR will get a look in taking sports photos but it's primary purpose in life will be staring down my telescope in prime focus & projection modes.
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Based on these 2 parameters I would highly recommend the 40D, with its 6.5 frames per second capability (for sports) and track record for delivering top-quality astro images.
There's a lot more to consider, but in a nutshell the 40D would be my pick of the 3 DSLRs you've listed, although it's a little more expensive. Not much more, though.