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Message: <blockquote data-quote="Mestre" data-source="post: 70071" data-attributes="member: 6032">That Sigma is the low-end of the brand.I own a couple Sigma but they are EX - the best construction lens. If you want to try a Sigma, don't buy any lens without HSM (it's the high speed focus), lens without it are very slow to focus. If you consider Tamron, the USM is the best focus system, although Tamron doesn't have a code for top quality lens.There are some 3rd party lens that deliver as good as some Nikon counterparts, but as Marcel said, if you want maximum quality it'll resume to Nikon's 70-200 VRII 2.8 and 24-70 2.8.</blockquote>