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<p>[QUOTE=&quot;physics-fan3.14, post: 2611395, member: 19165&quot;]The advantage of a 150-180 over a 90-100 (which is what I have) is that the farther away you pull the lens, the higher the angle you can effectively get your lights. This makes a difference for some coins. The disadvantage, as mentioned already, is that your copy stand might not support this distance. </p><p><br /></p><p>If you don&#039;t have it already, I highly suggest getting Mark Goodman&#039;s book on coin photography. He has a chapter about macro lenses and their focal lengths, and talks about the advantages/disadvantages of each.[/QUOTE]</p><p><br /></p>

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