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<p>[QUOTE=&quot;desertgem, post: 626163, member: 15199&quot;]Most of the inexpensive USB scopes do not have the ability to image a whole coin except maybe a 3cent. They emphasis the magnification in the ads, but the optical field is very narrow ( due to the lens construction). Some of the better ( and more expensive) USB scopes have a more sophisticated lens system that combines a wide field ( they sometimes call it extended, WF, WD, etc.) with the magnification. These are more complicated to build and I think for most they are in the $300 + range. The find use in medicine, &quot;CSI&quot; , gemstones, jewelry, and and collectibles ( coins, stamps, insects, etc.) These can easily go from full Morgan size to 200X or more on pinhead size. They are usually limited to less than 5Mp.</p><p><br /></p><p>In microscopy,<b> magnification</b> is always second to the <b>resolution</b>. You could have a lens that magnifys 1000X with such a punk resolution, that you can&#039;t tell much.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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