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Message: <blockquote data-quote="Mike D90" data-source="post: 296189" data-attributes="member: 17556">I probably have this wrong but I recently wondered the same thing while researching some lens information.I think that the fewer the elements the better the image quality can be. The way they are grouped has to do with lens function and how it disperses the light which I think adds to image quality.  Special glass, such as aspherical and ED elements, are sometimes bonded to another element.  I do not know what to think about the number of groups though.Maybe that will get some others to chime in.  I doubt I know what I am talking about.</blockquote>