A group of Taiwanese camera-mount-modifying-enthusiasts created a M adapter for Sony NEX E-mount cameras with a build-in focus helicoid that could turn a Leica M lens into a macro lens. "The Helicoid" allows you to further close focus than your normal M mount lens could:
- 50mm with minimum focus distance of 1m was able to focus at 0.43m
- 50mm with minimum focus distance of 0.75m was able to focus at 0.38m
- 75mm with minimum focus distance 1.2m was able to focus at 0.73m
- 90mm with minimum focus distance 1m was able to focus at 0.73m
Several sample images taken with different lenses are available in the same thread - in one case they managed to get a 15mm 2.8 zm lens to focus on a subject literally inside the lens hood. The adapter is in pre-production stage and should be available for sell in June.