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Lets start off by saying 17-85IS can only be used on the rebel or 20D, while the 28-135IS is for all EOS cameras.
Alot of people use the 28-135IS, but they don't like it on a 1.6x crop camera. So Canon decided to release the 17-85IS which is the smaller brother of the 28-135IS
ex. 17-85 x 1.6 = 28-135IS
Same lenses. It just depends if you want more wide, or more telephoto
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