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Message: <blockquote data-quote="WayneF" data-source="post: 326838" data-attributes="member: 12496">I thought the diagrams were excellent, and shows the point very well. There are the three factors, and of course, they can combine and interact.   The one little thing I didn't like was the middle one with subject distance, seeming to show the subject at the back of the distant zone.  The problem of course is that infinity is only a couple of feet beyond 20 feet (does not show the rear zone, but it was linear up to that point).   And rotating focus rings on lens barrels are marked that way too, but somehow it seems to miss something right at that one spot.  <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" />   But overall, very good charts.</blockquote>