Paul,
Another thing you need to remember is that all digital cameras that do not use a full 35mm size CCD/CMOS sensor suffer from a magnification effect. In the case of the Rebel/300D/10D it's 1.5X. So , in effect, your shot at 200mm was actually the equivalent of a 300mm telephoto (200mm X 1.5 Fcator) so trailing would surely be evident and unavoidable.
Just some info for you.
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