K&F Concept Lens Mount Adapter, Contax/Yashica (C/Y) Lens to Sony Alpha NEX E-Mount Camera Allows Contax Zeiss C/Y lens to fit on Sony E-Mount NEX camera body. There are no electrical contacts in the adapter ring, exposure and focus has to be adjusted manually. With precise design and high technology, made of brass and aluminum (not plastic). Compatible Cameras (Including, but not limited to): Sony NEX-3 NEX-3C NEX-3N NEX-5 NEX-5C NEX-5N NEX-5R NEX5T NEX6 NEX7 NEX-F3 a6000 a5000 a3500 a3000 Alpha A7 A7R NEX-VG10 VG20 etc NOTE: This adapter will NOT fit on the Sony a7S, a7 II, a7S II, and a7R II. Please note: Infinity focus positionthe position of the infinity mark of the telephoto lens or super telephoto lens is shifted slightly to the positive side to enable focus adjustment even when focus shift is caused due to temperature changes.The shift range is denoted by an L-shaped line, Be sure to check the focus through the viewfinder even when you shoot at infinity.