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Photography Q&A
Help me understand DOF a little better
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<blockquote data-quote="Bob Blaylock" data-source="post: 502295" data-attributes="member: 16749"><p>Surely this hasn't always been true, and I don't know that it is now of most lenses, though you're probably right in characterizing it as being associated with lower-priced modern lenses.</p><p></p><p> Back in the days of manual-only cameras, I think it would have been prohibitively difficult to manage exposure properly with a zoom lens that changed aperture as it changed focal length, in the manner that some modern zooms do. This seems like something that could only be made workable by modern electronics that can keep track of this change and account properly for it.</p><p></p><p> I do know that the one zoom lens I have from the old days does not have this changing-aperture issue. I'd bet that very, very few, if any at all, from that period, do. But then back then, zoom lenses weren't terribly common. They were generally considered, then, to produce poorer image quality than comparable primes, so they were not terribly favored, then, by serious photographers who cared more about the quality of their images than of the convenience that a zoom offers. And now that I think about it, the convenience that is the advantage that a zoom lens has to offer would be completely negated if you had to manually account for the way the aperture changes on many modern zooms along with the focal length.</p><p></p><p></p><p></p><p></p><p> A couple of my threads from a while back exist to illustrate this relationship. In each of these threads, with a different lens, I give a practical demonstration of how depth-of-field and other aspects of the image quality change with the aperture setting. It's probably worthwhile for the OP, [USER=40831]@DonnieZ[/USER], to have a look at them…</p><p></p><ul> <li data-xf-list-type="ul"><a href="http://nikonites.com/education/25599-aperture-depth_of_field-relationship-nikkor-s-50mm-f1-4-a.html" target="_blank">http://nikonites.com/education/25599-aperture-depth_of_field-relationship-nikkor-s-50mm-f1-4-a.html</a></li> <li data-xf-list-type="ul"><a href="http://nikonites.com/education/25527-aperture-depth_of_field-relationship-vivitar-85-205mm-f3-8-tele-zoom.html" target="_blank">http://nikonites.com/education/25527-aperture-depth_of_field-relationship-vivitar-85-205mm-f3-8-tele-zoom.html</a></li> </ul></blockquote><p></p>
[QUOTE="Bob Blaylock, post: 502295, member: 16749"] Surely this hasn't always been true, and I don't know that it is now of most lenses, though you're probably right in characterizing it as being associated with lower-priced modern lenses. Back in the days of manual-only cameras, I think it would have been prohibitively difficult to manage exposure properly with a zoom lens that changed aperture as it changed focal length, in the manner that some modern zooms do. This seems like something that could only be made workable by modern electronics that can keep track of this change and account properly for it. I do know that the one zoom lens I have from the old days does not have this changing-aperture issue. I'd bet that very, very few, if any at all, from that period, do. But then back then, zoom lenses weren't terribly common. They were generally considered, then, to produce poorer image quality than comparable primes, so they were not terribly favored, then, by serious photographers who cared more about the quality of their images than of the convenience that a zoom offers. And now that I think about it, the convenience that is the advantage that a zoom lens has to offer would be completely negated if you had to manually account for the way the aperture changes on many modern zooms along with the focal length. A couple of my threads from a while back exist to illustrate this relationship. In each of these threads, with a different lens, I give a practical demonstration of how depth-of-field and other aspects of the image quality change with the aperture setting. It's probably worthwhile for the OP, [USER=40831]@DonnieZ[/USER], to have a look at them… [list][*][url]http://nikonites.com/education/25599-aperture-depth_of_field-relationship-nikkor-s-50mm-f1-4-a.html[/url] [*][url]http://nikonites.com/education/25527-aperture-depth_of_field-relationship-vivitar-85-205mm-f3-8-tele-zoom.html[/url][/list] [/QUOTE]
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