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Message: <blockquote data-quote="DW_" data-source="post: 49200" data-attributes="member: 8667"><p>Yeah, that's kinda on the lines that I was thinking. My guess is the cheaper, more traditional lenses, suffer from a smaller aperture due to the stream of light narrowing as the focal length increases, which would not be a function of mechanics but rather a function of optics. Whereas the constant aperture lenses must do something unique with the stream of light that keeps it from narrowing as the focal length increases. But again, this is just my ponderings and I may be way off base with them. I think it would be interesting to know exactly how a constant aperture lens works and why all lenses are not that way.</p></blockquote><p></p>