M-Mount Lens Adapter Ring The M-mount adapter ring is developed with the support of Leica Camera AG, making it possible to mount Leica M lenses (DMW-MA2M) on Lumix G cameras - for fun shots from the combination of Leica lenses and the Lumix G series, the cutting edge of Panasonic digital technology. These adapters allow you to use the MF (manual focus) assist to enlarge the selected area when focusing manually.