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Message:: [QUOTE="rmpsrpms, post: 1756703, member: 31773"]I don't know what "rendering" is but I do use focus stacking extensively. It is only useful when the depth of field is too shallow to capture the entire field sharply. This is usually not an issue for modern coins that are flat with fairly low relief. For ancients, it can be quite useful. Also if you need to shoot the coin at an angle for lighting purposes, stacking can ensure the entire coin is sharp. For higher magnification imaging, the situation is completely different. Depth of field drops rapidly as magnification increases, so focus stacking is almost universally required above 1:1 or 1x magnification. Ironically, the higher the "quality" of the objective or lens, the more stacking is needed. Here is an image of a 1955-S/S/S RPM#1 in EDS taken with a Nikon 4x PlanApo 0.2 objective that required 31 images to make the stack...Ray <img src="http://i943.photobucket.com/albums/ad273/rparkhurst/55-S%20Roll%20Search/55SSS-4.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />[/QUOTE]