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Paul, what Humayan said about genuine Canon has relevance as well. Quality control on the other brands can be spotty, it's not unheard of to get a bad copy of an otherwise well regarded lens from both Tamron and Sigma. My preference is to buy genuine Canon, I've had just 2 Sigma Lenses, the first (17-70) was excellent, but after a period it's AF developed front focus issues and the second (the latest 12-24 Zoom) can only be described as anysmal (very poor sharpness).
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