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Nikon DSLR Cameras
Out of Production DSLRs
D200
60mm F2.8 AFS
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<blockquote data-quote="WayneF" data-source="post: 290756" data-attributes="member: 12496"><p>fstop number = focal length / aperture diameter.</p><p></p><p>When lenses focus up close, their lens must rack out forward, which is longer (or they might be internal focus), but the lens focal length must become longer to achieve this closer distance. This computes a new fstop value, your f/3 instead of f/2.8. This maximum aperture computed value will be closer to f/5 when up close near 1:1. This is very normal. </p><p>(of course, we would not consider using f/5 at 1:1 closeup, due to depth of field).</p><p></p><p>So just how it is. There is nothing wrong. Consider it a plus that the lens handles this automatically. Try focusing it at a little greater distance to see f/2.8.</p><p></p><p>Normal lenses don't focus very close, and we don't normally see this on them.</p></blockquote><p></p>
[QUOTE="WayneF, post: 290756, member: 12496"] fstop number = focal length / aperture diameter. When lenses focus up close, their lens must rack out forward, which is longer (or they might be internal focus), but the lens focal length must become longer to achieve this closer distance. This computes a new fstop value, your f/3 instead of f/2.8. This maximum aperture computed value will be closer to f/5 when up close near 1:1. This is very normal. (of course, we would not consider using f/5 at 1:1 closeup, due to depth of field). So just how it is. There is nothing wrong. Consider it a plus that the lens handles this automatically. Try focusing it at a little greater distance to see f/2.8. Normal lenses don't focus very close, and we don't normally see this on them. [/QUOTE]
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Nikon DSLR Cameras
Out of Production DSLRs
D200
60mm F2.8 AFS
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