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Hi Jeffcop
I am another owner of a 40D and love it. It comes with a great software pack which contains a utility program which allows full control of the camera including bulb shooting through the USB connection to a computer.
The larger frame and Magnesium body is a little heavier but not enough to cause balancing problems. I expect the 450D to have smaller pixels than the 40D on the same size chip smaller Pixels + more light required = longer exposures required. I stll believe the 350D was probably the pick of the bunch for Astro imaging but the 40D has a lot of nice features.
Good luck with your choice, Stick to Canon and you can't go too far wrong.
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