What is the difference in these two Sigma lenses

Started Aug 29, 2011 | Discussions thread
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seansrs33 Regular Member • Posts: 201
What is the difference in these two Sigma lenses

Sigma 120-300mm f/2.8 AF APO EX DG OS HSM Lens for Canon Digital SLRs vs. Sigma 120-300mm f/2.8 EX DG IF HSM APO Telephoto Zoom Lens. If you were to shoot sports like footbal, which one would be recommended?

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