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If what Footprint has to say is correct, then a 300D at say $300, (second-hand) would be better than a 40D at some $1200. I have both a 300D and a 40D, but have not used the 40D very much for Astro work, but the weight of the 40D makes a considerable difference to the balance on my GEM mount. Something to bear in mind.
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