The Voigtlander Leica M to Sony E Adapter is a mechanical adapter that allows you to mount Leica M-mount lenses to Sony NEX cameras for both still and video work.
This adapter provides no electronic communication between the camera and lens. You must manually make all aperture and focus adjustments on the lens itself. The aperture you select won’t be displayed on the camera, and it won’t show up in the EXIF data.
Please Note: If you’re using this adapter on a Sony a7 / a7R, you’ll want to stay away from the Leica 135mm f/3.4 APO Telyt M. Due to design, it has a hard-edge vignette.