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<p>[QUOTE=&quot;geekpryde, post: 1953138, member: 36248&quot;]He is talking about focal length of a camera lens.&nbsp;&nbsp; To summarize what he said, dont use anything less than 100mm for coins.&nbsp; &nbsp; Some camera have a smaller frame (image sensor) than traditional 35mm film, so they have something called a crop-factor, so on MOST consumer level DSLR you need to multiply the listed focal length on the lens by 1.5.&nbsp;&nbsp; For example, the best lens for coins IMHO is the 105mm Nikkor Micro, this is really (105 x 1.5= 157.5mm equivalent lens)&nbsp; &nbsp;&nbsp; [USER=19463]@dougsmit[/USER]&nbsp; (I think) is saying 150mm is just about perfect, so my example is about perfect.&nbsp; &nbsp; However, since some people with big $$ have &quot;full-frame&quot; cameras, this 105mm lens would only be 105mm, and he is saying this may not be good enough.&nbsp;&nbsp; On a full-frame camera, you would want to buy a macro lens that said 150mm or more to get great coin photos.</p><p><br /></p><p>Perhaps see my thread here.&nbsp; <a href="https://www.cointalk.com/threads/coin-photography-lens-commentary-using-nikon-d7000.247641/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/coin-photography-lens-commentary-using-nikon-d7000.247641/">CLICK ME</a></p><p><br /></p><p>The problem with 150mm and above, you need to get WAY back from very large coins.&nbsp; &nbsp; On USA coins, it&#039;s not a problem.&nbsp; But if some ancient coins are really plate sized, this will be an issue.&nbsp; &nbsp; I don&#039;t know much about ancient coins, are they really that big?</p><p><br /></p><p><img src="http://digital-photography-school.com/wp-content/uploads/2008/08/full-frame-crop-factor.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]</p><p><br /></p>

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