Can't say I'm aware of any lens fitting differences between a 400D and a 450D. As long as it has a canon EF or EF-S compatible lens fitting. The Sigma 150-500mm is reasonable value if you need that much reach, though I do recommend you get a firm grip of your present stuff before splashing out. I thought a 1 in 10 hit rate for a cracking shot not too bad myself. I've taken 100's of shots of a location/subject and been glad of only getting a couple good shots. That's the beauty of digital shooting.
All the world's a stage and we are merely players . . . . .
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