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Anonymous
changing focus in simple lenses is just a matter of moving the objective lens further from focal plane for closer focus, so in that case certainly. some of the more highly desgined lenses have moving internal elements, sometimes more than one, and i'm not sure if you can use this simple technique for them. i guess they're so awesome already you probably dont need to, but if anyone knows how en extender would work on one of those constant focal length or IF lenses i would like to know, plox
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