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Message: <blockquote data-quote="Bob Blaylock" data-source="post: 437481" data-attributes="member: 16749">I think it has a lot to do with the rise of ever-sophisticated and automated cameras.  Can you imagine having a 1970s-vintage all-manual camera, and trying to make sense of a zoom lens whose aperture settings change according to the focal length?  I think it'd be nearly impossible., and for that reason, I think that if such variable-aperture zooms existed, then, they must have been extremely rare.  Such lenses are really only feasible, today, because of the sophisticated degree of communication that now exists between them and the camera to which they are mounted.</blockquote>