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Nikon DSLR Cameras
General Digital SLR Cameras
Zoom Lens Ratio 18-200mm
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<blockquote data-quote="WayneF" data-source="post: 439544" data-attributes="member: 12496"><p>How far was the block wall?</p><p></p><p>Marked focal length is only correct (nominally) for infinity focus. </p><p></p><p>Speaking of prime lenses, as you focus closer, the focal length necessarily changes. Zooms too, however zooms do all sort of internal tricks, most bets are off.</p><p></p><p>Try your test focused at infinity, where the marked numbers have meaning. I feel sure the lens does what it should, but it might not be what you are expecting.</p></blockquote><p></p>
[QUOTE="WayneF, post: 439544, member: 12496"] How far was the block wall? Marked focal length is only correct (nominally) for infinity focus. Speaking of prime lenses, as you focus closer, the focal length necessarily changes. Zooms too, however zooms do all sort of internal tricks, most bets are off. Try your test focused at infinity, where the marked numbers have meaning. I feel sure the lens does what it should, but it might not be what you are expecting. [/QUOTE]
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Nikon DSLR Cameras
General Digital SLR Cameras
Zoom Lens Ratio 18-200mm
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