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  Reviews by: Robert Kester  

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Sigma 17-50mm F2.8 EX DC OS HSM

Review Date: Sep 19, 2010 Recommend? no | Price paid: $650.00

Pros: Cost, 6-year warranty, past positive experiences with Tamron lenses
quality control

I did not give an overall rating or a build quality rating as I believe the copy of the lens I purchased was defective. The images were not sharp at any aperture setting and the auto-focus was both slow and noisy. I was influenced to buy this lens because I own another Tamron lens and couldn't be happier with it. I felt the 17-50 OS deserved a shot as an alternative to the Canon 17-55 IS based on both price and length of warranty but once I tried it out on a 7D I could not talk myself into volunteering to do further QC for Tamron so I returned it and bought the Canon. I still think it was worth a shot and will try Tamron products in the future.