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<blockquote data-quote="pforsell" data-source="post: 618508" data-attributes="member: 7240"><p><strong>Re: New Macro Lens in</strong></p><p></p><p>Depth of field depends on two factors, magnification and f-number.</p><p></p><p>Focal length, subject distance, size and circle of confusion (the radius at which blur becomes visible) together determine the magnification.</p><p></p><p>Depth of field does not depend on lens or camera design other than the variables in the formula so there are indeed general formulas to calculate depth of field for all cameras and lenses. </p><p></p><p>You could use something like dofmaster.com which works reasonably up to 1:1 magification. Please note that getting more accurate numbers will be hard work, since all lenses focus by reducing focal length, thus you'll need to determine the FL yourself at high magnifications. And this is the reason why relative aperture also changes at high magnifications.</p></blockquote><p></p>
[QUOTE="pforsell, post: 618508, member: 7240"] [b]Re: New Macro Lens in[/b] Depth of field depends on two factors, magnification and f-number. Focal length, subject distance, size and circle of confusion (the radius at which blur becomes visible) together determine the magnification. Depth of field does not depend on lens or camera design other than the variables in the formula so there are indeed general formulas to calculate depth of field for all cameras and lenses. You could use something like dofmaster.com which works reasonably up to 1:1 magification. Please note that getting more accurate numbers will be hard work, since all lenses focus by reducing focal length, thus you'll need to determine the FL yourself at high magnifications. And this is the reason why relative aperture also changes at high magnifications. [/QUOTE]
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