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Photography Q&A
Does standing further back & zooming in increase the acceptable focus zone?
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<blockquote data-quote="WayneF" data-source="post: 550549" data-attributes="member: 12496"><p>Almost, but not necessarily exactly equal DOF.</p><p></p><p>A 2x greater distance increases DOF.</p><p>For same subject size, that requires 2x longer focal length, which decreases DOF.</p><p></p><p>But the math formula is complicated, and we cannot assume exactly equal and opposite effects.</p><p>But it is close.</p><p></p><p>There is an old rule of thumb that says any two pictures showing the same subject size will have the same depth of field. And again, pretty close, however, perspective of where you stand to do this changes things, which means it sort of depends on which depth into the picture we examine. But to a superficial glance, it seems very true.</p></blockquote><p></p>
[QUOTE="WayneF, post: 550549, member: 12496"] Almost, but not necessarily exactly equal DOF. A 2x greater distance increases DOF. For same subject size, that requires 2x longer focal length, which decreases DOF. But the math formula is complicated, and we cannot assume exactly equal and opposite effects. But it is close. There is an old rule of thumb that says any two pictures showing the same subject size will have the same depth of field. And again, pretty close, however, perspective of where you stand to do this changes things, which means it sort of depends on which depth into the picture we examine. But to a superficial glance, it seems very true. [/QUOTE]
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Photography Q&A
Does standing further back & zooming in increase the acceptable focus zone?
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