... This is my story of Sigma 12-24 lens for Canon.
How come I always end up shooting on the wide or long end of my 28-70 zoom? I also wanted to go wider than my Canon EF 20mm f/2.8 USM Wide Angle Lens for Canon SLR Cameras. Corners on Canon's 20mm were all smeared on until you stopped down to f16, which is the only usable aperture if you want edge to edge sharpness. So after lots of research I ordered Sigma. I was hoping to hit a jackpot and have a good sample. Unfortunately, that was not the case. The first lens I got was somebody returned lens with missing soft case, and it had a soft zone on the left side. Amazon was quick to correct the problem, and shipped me another copy. Second lens was brand new, but had a soft patch on the right side! I contacted Sigma's Tom Soble, and he advised me to send in the lens AND a camera for calibration. Since I just got back the Canon EOS 1Ds Mark III 21.1MP Digital SLR Camera (Body Only) from Canon after having fixed focus issues - according to Canon "it was found that the adjustment of the AF assembly was incorrect the auto focus did not operate properly Electrical adjustments were carried out of the AF assembly". So I did not send in the lens, but just got my money back from Amazon. As much as I enjoyed the wide angle perspective, I could not justify soft zones in my images. Also, whenever I would try photograph anything using DOF scales, the image would turn super soft, to the point that it would be unusable, maybe that was part of some decentering issues my Sigma 12-24 had. I would love to have a "good" copy of the lens to compare to, maybe all the issues were due to the bad samples I had? I have 2 Sigma lenses - Sigma 50mm f/1.4 EX DG HSM Lens for Canon Digital SLR Cameras and Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens for Canon SLR Cameras which are fine pieces of glass.
The also purchased Canon EF 14mm f/2.8L II USM Ultra-Wide Angle Lens for Canon Digital SLR Cameras, but was not happy with flexibility of use/price ratio, so the lens was returned. I still have Nikon 14-24mm f/2.8G ED AF-S Nikkor Wide Angle Zoom Lens on my short list as a potential candidates. I have borrowed my friends Leica 19mm (first generation) and was very happy with it! He wants it back, so I am thinking about Leica 21-35mm as a compact travel lens. You can see and read more of my thoughts at agniusdigital.com ...
Check Amazon Price and Read More Reviews on Sigma 12-24mm f/4.5-5.6 EX DG IF HSM Aspherical Ultra Wide Angle Zoom Lens for Canon SLR Cameras
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