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<p>[QUOTE=&quot;SuperDave, post: 2600019, member: 1892&quot;]My last coin purchase of 2016 won&#039;t arrive until next year - it&#039;s on layaway - so you&#039;ll have to suffer. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie7" alt=":p" unselectable="on" unselectable="on" /> You&#039;ll suffer even <i>more</i> once I get the last numismatic <b>arrival</b> (today) of 2016 up and running ( <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" /> ):</p><p><br /></p><p>[ATTACH=full]567360[/ATTACH] </p><p>It&#039;s a Z-axis stage, used for minute incremental vertical adjustment. The problem with bringing significant magnification into coin photography is that depth of field becomes almost nonexistent, and you have to take a succession of images with the focus point ever-so-slightly adjusted each time, and then combine them in software in a process called focus stacking or Z-stacking. The software understands which part of each image is in sharp focus, and discards all the unfocused information while assembling the &quot;good&quot; stuff into one cohesive image.</p><p><br /></p><p>If you&#039;ve followed some of the work [USER=31773]@rmpsrpms[/USER] has posted here, you&#039;ve seen it in action. It&#039;s how he can make a mint mark fill the screen in sharp focus. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>To give you an idea of the vertical adjustment involved, the dial is calibrated in microns....[/QUOTE]</p><p><br /></p>

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