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if its for astrophotography, i would go for one of the 100series over the 30D,
They are basicly the same, the only major difference is that the 30D has a magnesium frame, and some other features that you wouldnt use at all for astrophotography, just for conventional photography.
If you are gonna use it it soley for astrophotography you might want to consider buying a filter modified version such as one of the hutech's or get it modded. it will majorly increase the sensitivity on many astro objects.
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