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Photography Q&A
understanding DOF
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<blockquote data-quote="WayneF" data-source="post: 490198" data-attributes="member: 12496"><p>If you shoot at f/22, it will be f/22, and it won't be f/5.6, and if it is overexposed, this will not be the reason. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> The lens works normally at its marked aperture. It may not do f/3.5 in every case, but it will do what the viewfinder says it does. This part is a needless concern. It will be f/22.</p><p></p><p>No clue what you mean about Canons, but f/stop is an extremely well known characteristic of 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>Hyperfocal distance is such combination that focusing at this distance will be "sharp" (within the defined limits) from infinity to a close distance. The camera is of course only focused at the one distance, so some approximations apply. There are many possible combinations of hyperfocal, and DOF calculators typically show it (example <a href="http://www.dofmaster.com/dofjs.html" target="_blank">Online Depth of Field Calculator</a> ) and it depends on sensor size, but maybe a 45mm lens at f/11 focused at hyperfocal 30 feet is said to cover from 15 feet to infinity feet (one example).</p><p></p><p>If you have a subject at say 20 feet, it will come out sharper if you focus on it at 20 feet instead of the hyperfocal 30 feet. But that loses the effect at infinity. So we do what is important in the situation.</p><p></p><p>f/22 does cause diffraction, which is a little less sharp, which is a negative, however often the added DOF helps more than the diffraction hurts. Most things are tradeoffs like this. We do what helps.</p></blockquote><p></p>
[QUOTE="WayneF, post: 490198, member: 12496"] If you shoot at f/22, it will be f/22, and it won't be f/5.6, and if it is overexposed, this will not be the reason. :) The lens works normally at its marked aperture. It may not do f/3.5 in every case, but it will do what the viewfinder says it does. This part is a needless concern. It will be f/22. No clue what you mean about Canons, but f/stop is an extremely well known characteristic of lenses. :) Hyperfocal distance is such combination that focusing at this distance will be "sharp" (within the defined limits) from infinity to a close distance. The camera is of course only focused at the one distance, so some approximations apply. There are many possible combinations of hyperfocal, and DOF calculators typically show it (example [URL="http://www.dofmaster.com/dofjs.html"]Online Depth of Field Calculator[/URL] ) and it depends on sensor size, but maybe a 45mm lens at f/11 focused at hyperfocal 30 feet is said to cover from 15 feet to infinity feet (one example). If you have a subject at say 20 feet, it will come out sharper if you focus on it at 20 feet instead of the hyperfocal 30 feet. But that loses the effect at infinity. So we do what is important in the situation. f/22 does cause diffraction, which is a little less sharp, which is a negative, however often the added DOF helps more than the diffraction hurts. Most things are tradeoffs like this. We do what helps. [/QUOTE]
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