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Message: <blockquote data-quote="Fred Kingston_RIP" data-source="post: 184002" data-attributes="member: 10742"><p>The focus point becomes a factor at the widest f-stop, so use that as your base... OTOH, if you have a lens that you use at a particular f-stop... use that as your base... If you read all that has been written on the subject, you'll find the answer to your question all over the map...<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> Somewhere in the middle is the answer... I have adjusted mine to the largest f-stop (small number) because that reveals the shortest depth of field... and most of what I shoot is portrait so focusing on eyes is the sweet spot where I want to be...</p></blockquote><p></p>