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<p>[QUOTE=&quot;SuperDave, post: 2362055, member: 1892&quot;]Hmmm. That makes this into an interesting problem. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Have you tried autofocus? I&#039;ve owned 4 examples of Canon&#039;s 100mm Macro, and all 4 autofocused perfectly on coin shots, not even being fooled by slabs. The Morgan I posted on Page 1 of this thread was autofocused, and that was somebody else&#039;s lens. Slabs don&#039;t even fool them, and I never manually focused when shooting with one. I held the shutter down halfway until it autofocused, let it go (focus didn&#039;t change) and triggered the shot with the mouse.</p><p><br /></p><p>That does not, of course, guarantee similar results from your Nikon but I recall you mentioning you didn&#039;t use it; have you given it a shot? Your camera has an Autofocus Area Mode setting which will allow you to tell it where to focus, which should help.</p><p><br /></p><p>Another alternative is to rig a &quot;handle&quot; to attach to the focus ring - it&#039;d have to be light, obviously - which extended away from it. That would increase the radius of the circle your adjustment traveled, effectively allowing you to move the focusing ring in a smaller arc for a given input.</p><p><br /></p><p>The third alternative is a z-stage as Ray mentions. </p><p><br /></p><p>You have 24MP in hand, 6000x4000 pixels, meaning you don&#039;t need to worry as much as owners of smaller sensors about filling the sensor with the coin. It&#039;s like this: <b>You cannot buy a monitor capable of displaying the full resolution of your camera</b>. They don&#039;t exist. In fact, Dell&#039;s new 5k monitor - the highest-resolution unit on the market at 5120x2880 - can&#039;t display more than the product of a 12MP Rebel XSi (from 2009) image all at once.</p><p><br /></p><p>A sensor-filling coin image from your camera has to be downsized to 25% of original to post online to be polite. That&#039;s the size I cropped my images from Page 1 to, 1000 vertical pixels. The point is, we&#039;re talking about the very last few percent of <i>possible</i> quality in discussions like this one; the cheap Rebel XS we recommend for the $400 bellows system is still far more camera than &quot;required.&quot;[/QUOTE]</p><p><br /></p>

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