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<p>[QUOTE=&quot;SuperDave, post: 2773468, member: 1892&quot;]The screws are to ensure a camera won&#039;t mount directly to it. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>I don&#039;t see anything at the rear of the vertical support for gearing, so this looks to be a sliding arrangement where the red knob is just a clamp on the tube. That means it will be of no assistance in focusing, so a focusing rail or helicoid will be a necessary addition. </p><p><br /></p><p>In these pics, the relationship between the mounting plate (with the 4 screws mentioned above) and the vertical support bothers me. If that vertical support is not <i>exactly</i> perpendicular to the base, and if the mounting plate and vertical support are not <i>exactly</i> parallel, your camera will not be square to the coin. Given the miniscule depth of field available in this type of photography, getting camera and subject perfectly square to each other is of paramount importance. A copystand which will not hold the camera square to the base is a dealbreaker; you will drive yourself nuts trying to tilt the coin to be square to the lens.</p><p><br /></p><p>It could just be the pics, but that plate sure doesn&#039;t look square to the rest of the assembly.[/QUOTE]</p><p><br /></p>

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