Using the newes version of the Techart Adapter allows Autofocus with manual focus Leica M lenses on a Sony camera. After an easy setup the funktionis quite staright forward and easy to handle. The adapter uses a kind of Special communication via the apetrure setting in the camera to talk to the lens. Teh Adapter moves and by that changes teh backfocus of the lens. the setting on the lens should be either infinity or about 3m depending what the longest disctance inthe frame will be. After 7 years of development, the Techart Leica M to Sony E Autofocus Adapter has returned with better autofocus performance, sleeker design and way more powerful motors. 4 radially positioned, small and light servo motors 4-axis support guarantees much faster focusing Support heavier lenses without wobbling World’s first bulge-less design and more obstructions with accessories New unicase machining technology further compressed the adapter’s size Compatible with all the latest Sony Full Frame & APS-C camera models (A7R5, A7R4, A7R, A1, A9ii, A7C, A6600, ZV-E10, etc) USB Update tool included Support in camera 3-axis image stabilisation and relies on the phase detection AF of the Sony cameras to turn your manual lenses into autofocus lenses. Optimal 4.5mm extension balances AF speed and usability. Stack additional adapters to enjoy autofocus with literally ANY lenses (EF / F / OM/ PK/ FD / LR / L39, etc) not applicable to LTM/M mount lenses that are with the infinity lock button.