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<p>[QUOTE=&quot;dougsmit, post: 2038591, member: 19463&quot;]While I have no reason to know anything about Nikon products (I Canon), I am very much of the opinion that the Sigma macro (especially the 180mm) is good enough that it would be useless to &#039;upgrade&#039; to a Nikon product except for the purpose of impressing people who believe Nikon is better than the laws of optics allow.&nbsp;&nbsp; Certainly shooting through slab plastic would be a great equalizer as would using the images in sizes under 20x30&quot; size (including any online use where resolution is limited by monitors rather than lenses).&nbsp; In general, the limiting factor of photography of any type is the photographer unless we are talking about equipment below DSLR level.&nbsp; Manufacturers and programmers make good money selling upgrades to people who have never learned to use the previous model.&nbsp; When upgrading, first ask what it is about the old system that has never produced a satisfactory image in the hands of a fully competent worker and why it is that ours are not the equal to the best.&nbsp; In my case the answer is never an &#039;it&#039; and always just &#039;me&#039;.[/QUOTE]</p><p><br /></p>

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