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Nikon 60mm 2.8 not staying at 2.8?
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<blockquote data-quote="WayneF" data-source="post: 488643" data-attributes="member: 12496"><p>Right, it's a macro thing, just what lenses do. Ordinarily, it ought go to f/5.6 at 1:1 magnification.</p><p></p><p>Exposure Increase Factor = (m + 1)²</p><p></p><p>m is magnification, which is 1 at 1:1, so 2² is 4, which is two stops, so f/2.8 goes to f/5.6. And f/16 goes to f/32. </p><p></p><p> Some wide or long lenses (asymmetrical lenses) don't conform exactly though, so some slight variations.</p></blockquote><p></p>
[QUOTE="WayneF, post: 488643, member: 12496"] Right, it's a macro thing, just what lenses do. Ordinarily, it ought go to f/5.6 at 1:1 magnification. Exposure Increase Factor = (m + 1)² m is magnification, which is 1 at 1:1, so 2² is 4, which is two stops, so f/2.8 goes to f/5.6. And f/16 goes to f/32. Some wide or long lenses (asymmetrical lenses) don't conform exactly though, so some slight variations. [/QUOTE]
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Nikon 60mm 2.8 not staying at 2.8?
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