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Sigma 100-300mm f4 EX IF HSM APO

100-300if_1_
Review Date: Aug 26, 2012 Recommend? no | Price paid: $550.00 | Rating: 2 

 
Pros: Perfect zoom range
Cons:
Poor auto-focus quality, backward zoom mechanism.

Bought used and had it serviced by Sigma. Passed 100% from Sigma. Lens would not auto-focus with my Canon 1D Mark II & IV. Manual focus worked fine with excellent results. However, I shoot auto 99% of the time so the lens failure to work with my camera left me nothing but a bad taste. This was the second Sigma lens that failed me.