Classic rangefinder lenses focus much less close than their SLR-counterparts because of how the focusing with rangefinder cameras works. With the Voigtländer VM-E adapter you can focus these lenses much closer when using them on an E-mount camera. The adapter is not only a Leica-M to Sony E adapter but also a variable extension tube. It has its own helicoid by which you can focus your lenses much closer than with a conventional adapter. I have been using the Voigtlander VM-E close focus adapter for more than a year now and it has become a valuable addition to my kit.