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      05-23-2009, 07:44 PM   #4
TWiTCHY
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Drives: '08 SSII E92 M3
Join Date: Jul 2008
Location: Bellevue, WA

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Well it depends on what you want. On the XSi the 17-40mm is very similar to the 18-55mm. I wouldn't get the 17-40mm if you're going to use a digital crop DSLR. Instead, if you want wide-angle, get the 10-22mm. That's probably what you're looking for anyways.