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16-35 F4 and hyperfocal distance etc etc
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<blockquote data-quote="WayneF" data-source="post: 354756" data-attributes="member: 12496"><p>Back in the day, our prime lenses had the aperture markings (lines to extend to the distance scale) so we could see and set hyperfocal easily. We gave that up for zoom lenses. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>2.5m is half again past 1.75m, which is not an insignificant focusing error. </p><p></p><p> There are no sharp border lines in DOF, focus just gradually fades away until we hit the arbitrarily computed number, where we draw a line, but nothing is actually different on either side of that line. The farther you get from correct focus, the worse it gets. Saying, DOF is a limit, and saying precise focus is only possible at one distance, and at that distance, a point source will show as a point. If not at that distance, a point shows as a larger blurred circle (called Circle of Confusion, CoC). The farther, the bigger. The smaller your sensor, the more this circle will be enlarged to view it. The DOF number is arbitrary, since the CoC limit we choose is arbitrary, and also a standard viewing distance is assumed, typically is an 8x10 print (about 9x for 35mm film) viewed at 10 inches. DOF is simply about the magnification at which we view this blur. It is NOT a precise number, more a vague concept.</p><p></p><p>I don't know your sensor size and focal length (I assume D800 and 24mm ?) But that does say f/11 hyperfocal is 1.72m, thus the zone from 0.86m to 2763m (1.7 miles)... calculation based on vague assumptions (implying, maybe a little bit silly).</p><p></p><p>Hyperfocal assumes a "sharp enough" zone from half the hyperfocal distance to infinity. But if 1.7m, but if you have nothing to show at 0.86m, and you do want want to show 2.5m, absolutely nothing wrong with focusing at 2.5m, which then f/11 says 1 meter to infinity. Seems very adequate. You are not necessarily seeking the absolute maximum. You are trying to fit it to your situation, and less can be more. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>If you back off to f/5.6 there, then calculator says 2.5m is 14% into that depth zone (about 1 to 7 meters). Dunno, I always imagined it was 1/3 for landscape scenes (and about 1/2 for closer distances, certainly for macro).</p></blockquote><p></p>
[QUOTE="WayneF, post: 354756, member: 12496"] Back in the day, our prime lenses had the aperture markings (lines to extend to the distance scale) so we could see and set hyperfocal easily. We gave that up for zoom lenses. :) 2.5m is half again past 1.75m, which is not an insignificant focusing error. There are no sharp border lines in DOF, focus just gradually fades away until we hit the arbitrarily computed number, where we draw a line, but nothing is actually different on either side of that line. The farther you get from correct focus, the worse it gets. Saying, DOF is a limit, and saying precise focus is only possible at one distance, and at that distance, a point source will show as a point. If not at that distance, a point shows as a larger blurred circle (called Circle of Confusion, CoC). The farther, the bigger. The smaller your sensor, the more this circle will be enlarged to view it. The DOF number is arbitrary, since the CoC limit we choose is arbitrary, and also a standard viewing distance is assumed, typically is an 8x10 print (about 9x for 35mm film) viewed at 10 inches. DOF is simply about the magnification at which we view this blur. It is NOT a precise number, more a vague concept. I don't know your sensor size and focal length (I assume D800 and 24mm ?) But that does say f/11 hyperfocal is 1.72m, thus the zone from 0.86m to 2763m (1.7 miles)... calculation based on vague assumptions (implying, maybe a little bit silly). Hyperfocal assumes a "sharp enough" zone from half the hyperfocal distance to infinity. But if 1.7m, but if you have nothing to show at 0.86m, and you do want want to show 2.5m, absolutely nothing wrong with focusing at 2.5m, which then f/11 says 1 meter to infinity. Seems very adequate. You are not necessarily seeking the absolute maximum. You are trying to fit it to your situation, and less can be more. :) If you back off to f/5.6 there, then calculator says 2.5m is 14% into that depth zone (about 1 to 7 meters). Dunno, I always imagined it was 1/3 for landscape scenes (and about 1/2 for closer distances, certainly for macro). [/QUOTE]
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