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I have a 50-500 sigma lens that I use with my pentax k10D, and a few other sigma lenses. I did do my homework before i bought and they offered me value for money - fully knowing they were slow to focus and could be soft on occasions. but overall many of my photos are taken with sigma lenses, and canon ones as well, but with those all i bought were L lenses.
the overall point is buyer beware, but you do have consumer laws to help protect you with sales and product defect or performance, but you cant legislate laws for preconceived performances
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