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I've had quite a good run of Sigma lenses myself.. My 10-20 was a little funky.. but thats what I get for not spending the extra $300 on the Canon 10-22 USM..
All the other sigma's I've had,
24-60mm F/2.8 (Canon)
70-200mm F/2.8 (Nikon)
170-500mm F/3.5~5.6 (Canon)
300mm F/2.8 (Nikon)
Have been flawless.. All very fast to focus, the difference in image quality compared to the Canon/Nikon equivalent was barely distinguishable..
I think maybe you were expecting more for your money, or perhaps you placed too much stock in reviews you had read, without going into a store and having a test of the lens in question.. Thats always the best way in my opinion...
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