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Message: <blockquote data-quote="Stoshowicz" data-source="post: 363473" data-attributes="member: 31397">Actually this article is pretty good , but its fairly difficultly presented , does this say the best Fstop is always f11  at this point ?To summarize, if D is the focus spread expressed in millimeters, then the optimal f-stop which yields the sharpest possible image at the depth of field limits is N = sqrt(375 D). This works regardless of focal lengths, formats, and movements. The resulting resolution at the limits of depth of field (ie for your far and near points) cannot be improved in anyway and determine the maximum possible enlargment. Here are some tabulated values by whole fstops:Table of optimal fstops (1)</blockquote>