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Message: <blockquote data-quote="Eye-level" data-source="post: 51582" data-attributes="member: 6548">John maybe this explanation will be more clear...Except when using very close focusing, depth of field extends 1/3 in front and 2/3 behind the point upon which the lens is focused.  When focused at infinity, it is logical that 2/3 of the DOF, supposedly beyond infinity is wasted.  By refocusing on the nearest limit of DOF, all objects to infinity remain in focus but the DOF has been brought forward to include closer objects as well.  When focused on close subjects the DOF is shallow.  Now here is the critical part of your question and this is what you are after - focusing for the maximum advantage - By refocusing on the furthest limit of the DOF, the DOF can be increased to include not only the closest subject but also subjects further back.</blockquote>