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Sigma 70-200mm f2.8 EX APO IF HSM

Review Date: Dec 5, 2007 Recommend? yes | Price paid: Not Indicated | Rating: 10 

Pros: ?

What is the difference between the DG, the non DG, and the macro version of this lens? I keep seeing all three for sale (used) and I just don't know which is better. I shoot mostly sporting type events (low light, fast movement) and nature.