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What are the real-world differences between Canon, Sigma and other third-party 70-200 f/2.8 lenses?
I'm getting started with wedding photography, and was looking for a fast telephoto zoom to compliment my Tamron 17-50 f/2.8 (on a Canon 500D/T1i).
After extensive online research, the 70-200 f/2.8 ...
