Description With the M42-FX advanced adapter , you can make M42 mount lenses (Zeiss, Pentax, Praktica, Mamiya, Zenit) can be used on Fujifilm Fuji FX X mount cameras There is no ROM connection on the ring so diaphragm control of the lens is set manually Please installing/ uninstalling the adapter after turning off the camera It can focus to infinity Suitable for: Lens: M42 mount lenses (Zeiss, Pentax, Praktica, Mamiya, Zenit) Camera: All Fujifilm FX X mount cameras (such as: X-Pro 1, X-E1, X-M1) Material: Aluminum Package Included 1* m42-FX adapter 1* m42 body cap .