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I am not sure but I think the 400d has the same as the 30d.. but the 400d has auto noise reduction.. if you are going to use the new camera for astro photography any weight reduction can be helpful. 20d is only 8 meg I think and the 400d is 10 meg... the 400d body (and it comes in black like the 20d)can be had for $1250 if you shop around ..maybe cheaper. The red sensativity may require removal of the IR filter... please someone review my comments because I may have may facts wrong.
alex
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