Has anyone used the Sigma 18-250mm F3.5-6.3 DC OS HSM on a Canon Mount? I'm trying to decide between it and the Tamrom 18-270. Amazon's got a pretty good deal running on the Sigma to bring it down to $450 vs. $600 for the Tamron. http://www.amazon.com/exec/obidos/tg/detail/-/B001PGXEH4/ Been looking at the Tamron for a while because a friend has one, but just wanted a sale to pull the trigger.
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