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As a side note, when using a true macro lens (one capable of doing 1:1, or life size), the DOF is probably around 5mm at most. Anything not within the 5mm zone of acceptable sharpness is out of focus (OOF).
Dave
PS life size means that the subject being imaged will appear the same size as in real life on the image frame. So, if the object was 5mm long in real life, it'll appear 5mm on the image frame (roughly 1/7 of the width of the typical 35mm frame).
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