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Sigma 12-24mm f4.5-5.6 EX DG Aspherical HSM

Review Date: Jul 17, 2007 Recommend? yes | Price paid: Not Indicated | Rating: 10 

Pros: little to no flare, little distortion, quiet accurate focus, excellent IQ for wide zoom
Can't use filters, bulbous lens with hood that won't protect a lot

I have hesitated for over a year about buying this lens due to reviews citing QC problems. I bought it this week--and wish I had earlier. I did a head to head real life test, on tripod, with my very good Sigma 15-30 and was surprised to see the 12-24 do better--at all FL (did not expect much at longer end).

Its quite sharp, softer in corners but totaly expected with this ultra wide lens. Focus was quick, accurate and quiet. CA is controlled nicely and you have to push really hard to get it to flare. Lack of distortion is pretty amazing in this wide lens. Color is less warm than my 15-30, contrast is better. Overall, I'm really pleased with the lens. My copy had a stiff zoom but its loosened up quickly and now is just about right. Just a terrific lens on a 5D.