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<p>[QUOTE=&quot;benveniste, post: 2611464, member: 25547&quot;]In addition to what&#039;s been said here, the current Sigma 180mm f/2.8 OS is a significantly larger (8&quot; vs 6&quot; long, 86mm vs 72mm filters) and a full pound heavier than your 150mm lens.&nbsp; At 1:1, the working distance is about 36mm longer.&nbsp; If you&#039;re planning to shoot insects or use it an &quot;all-purpose&quot; telephoto it might be worth it to you, but my impression is that Sigma&#039;s currently selling a lot more 150mm&#039;s than 180mm&#039;s.</p><p><br /></p><p>My &quot;default&quot; choice for medium-sized coins is a 105mm macro.&nbsp; For large coins and medals, I switch to a 60mm macro, and for details of small areas I typically use a 50mm Apo-Rodagon on a bellows or a low-powered microscope.&nbsp; While I&#039;ve tried a few coin shots with an older Sigma 180mm macro, given my own lighting setups I&#039;ve found no advantage in using that length.[/QUOTE]</p><p><br /></p>

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