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Message: <blockquote data-quote="Clovishound" data-source="post: 814853" data-attributes="member: 50197"><p>Well, keep in mind to change a regular lens into a 1:1 macro, you need approximately the same distance as the focal length. So a 50mm lens will require 50mm of extension. That is a little over the 1 1/2" of the extender. It would require over 10 times that length to do the same for a 600mm lens. Of course, all this presupposes that the optics in a converter don't mess with the focus point of a lens given the length of the converter.</p></blockquote><p></p>