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<blockquote data-quote="DraganDL" data-source="post: 286183" data-attributes="member: 18251">Don't expect any wonders if you switch some of the &quot;off brands&quot;, like, say, Tamron 18-200mm 3.5-6.3 for Nikon 18-200 AF-S 3.5-5.6. In some aspects, the thing would be even worse (barrel distortion at 18mm are MORE pronounced on Nikon's 18-200mm)... Sigma's 18-200mm is lagging behind both. However, what could be gained is already on the paper - the difference between f/5.6 and f/6.3 at the longest end, and, related to that, somewhat better AF results in the low light situations. But, at the huge price difference.What I think worth considering is the full frame lens, like 28-200mm (AF-D or &quot;G&quot;, maybe), since anyway, your wife is more up to telephoto end (so that the gap between 18mm and 28mm wouldn't be the issue here). These lenses (AF-D as well as the newer &quot;G&quot; type) are superior to aforementioned 3 lenses in terms of a sheer optical and build qualities and might be even more affordable nowadays.</blockquote>

[QUOTE="DraganDL, post: 286183, member: 18251"] Don't expect any wonders if you switch some of the "off brands", like, say, Tamron 18-200mm 3.5-6.3 for Nikon 18-200 AF-S 3.5-5.6. In some aspects, the thing would be even worse (barrel distortion at 18mm are MORE pronounced on Nikon's 18-200mm)... Sigma's 18-200mm is lagging behind both. However, what could be gained is already on the paper - the difference between f/5.6 and f/6.3 at the longest end, and, related to that, somewhat better AF results in the low light situations. But, at the huge price difference. What I think worth considering is the full frame lens, like 28-200mm (AF-D or "G", maybe), since anyway, your wife is more up to telephoto end (so that the gap between 18mm and 28mm wouldn't be the issue here). These lenses (AF-D as well as the newer "G" type) are superior to aforementioned 3 lenses in terms of a sheer optical and build qualities and might be even more affordable nowadays. [/QUOTE]

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