The Fotodiox Lens Mount Adapter offers the flexibility to use a Leica M rangefinder lens with a Sony Alpha E-mount mirrorless camera body. With this adapter, you may focus at infinity and control the aperture manually. For lenses without a manual aperture ring, the adapter stops down the f-stop to the lowest value. The adapter also supports the aperture-priority mode of the camera. And, thanks to the hardened anodized aluminum design, the adapter resists corrosion.