I'm not sure about the 450d, but my Nikon does auto bracketing, I can set it to do 3, 5, or 7 shots at 1/3 EV intervals. That's what I'll be using when the time comes. At present I have to tap the remote between each shot, but there may be a way around that as well.
I just had a quick look on Google, seems that the 450d does AEB so look it up, it saves all the hassle.
Cheers
Stuart
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