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Something else to consider is, do Canon implement software capability and camera functionality differently between the 2 models? That is, can the 40D be customised more so than the 450D? Is the EOS Utility software more functionally rich with the 40D than the 450D? Does the 40D have a greater range of functions and operational capability that the 450D?
When operating at a telescope, if there are any differences in favour of the 40D, then you may find the $100 will be well spent if it delivers flexibility and easier operations.
Cheers
Dennis
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