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<p>[QUOTE=&quot;dougsmit, post: 1953310, member: 19463&quot;]The majority of macro lenses focus to life size 1:1 reproduction ratio which means that the image on the sensor can be as large as the coin itself.&nbsp; Using a &#039;crop&#039; camera That means you can fill the frame with a coin no smaller than about 13mm across.&nbsp; With a full frame camera that jumps to 24mm.&nbsp; To shoot smaller coins, you either add accessories (extension tubes) or just crop (the easy way).&nbsp; </p><p><br /></p><p>geekpryde is right about large coins.&nbsp; If you mainly collect silver dollars, you will not want even a 100mm lens.&nbsp; I have half a dozen ancient coins as large as a silver dollar so that is not a problem to me.&nbsp; The 100 to 150 mm range works well for people with a collection like mine (mostly 5 to 25mm).[/QUOTE]</p><p><br /></p>

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