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Technical question about a zoom lens
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<blockquote data-quote="Eyelight" data-source="post: 392015" data-attributes="member: 24753"><p>Focal length actually changes as the focus mechanism moves the elements. You can notice this, especially on a macro as you focus and the blur seems to enlarge/reduce. As focal length changes the f/stop changes since f/stop is a product of aperture diameter and focal length.</p></blockquote><p></p>
[QUOTE="Eyelight, post: 392015, member: 24753"] Focal length actually changes as the focus mechanism moves the elements. You can notice this, especially on a macro as you focus and the blur seems to enlarge/reduce. As focal length changes the f/stop changes since f/stop is a product of aperture diameter and focal length. [/QUOTE]
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Technical question about a zoom lens
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