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<blockquote data-quote="ZakSaenzPhotography" data-source="post: 6432" data-attributes="member: 1777">Hey Mark, I have several third party lenses and think they are all great. I have a Tamron 28-75mm 2.8 that stays on my D700, also a Tamron 70-200mm 2.8 that works great also. The Sigma 18-200mm OS is about the same size and weight as the Nikon version but I haven't used it enough yet to say how well it shoots compared to the Nikon. What I have shot with it so far has been good but again I do have it on my third camera which is a D300 which I use to teach some workshops and just general use stuff. In many independent tests lenses such as the Tamron, Sigma and Tokina all do well in their upper line stuff and sometimes actually do better as far as picture quality but where they can lack is in drive motor AF speed and image stabilization. This Sigma has the Hyper Sonic Motor and the cost is about half the price of Nikons at $369 <a href="http://www.adorama.com/SG18200SNK.html?kbid=64905" target="_blank">http://www.adorama.com/SG18200SNK.html?kbid=64905</a> I think it is a great buy at this price. The zoom does work the opposite way of Nikon though. Zak</blockquote>

[QUOTE="ZakSaenzPhotography, post: 6432, member: 1777"] Hey Mark, I have several third party lenses and think they are all great. I have a Tamron 28-75mm 2.8 that stays on my D700, also a Tamron 70-200mm 2.8 that works great also. The Sigma 18-200mm OS is about the same size and weight as the Nikon version but I haven't used it enough yet to say how well it shoots compared to the Nikon. What I have shot with it so far has been good but again I do have it on my third camera which is a D300 which I use to teach some workshops and just general use stuff. In many independent tests lenses such as the Tamron, Sigma and Tokina all do well in their upper line stuff and sometimes actually do better as far as picture quality but where they can lack is in drive motor AF speed and image stabilization. This Sigma has the Hyper Sonic Motor and the cost is about half the price of Nikons at $369 [URL]http://www.adorama.com/SG18200SNK.html?kbid=64905[/URL] I think it is a great buy at this price. The zoom does work the opposite way of Nikon though. Zak [/QUOTE]

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