Fotasy M42-FX Helicoid, M42 Screw Mount Lens Adapter /Macro Focusing Helicoid,  Compatible with Fujifilm X-Series Mirrorless Cameras This macro focusing Helicoid tube allows M42 lens to be used on Fujifilm X-mount camera body. This macro focusing Helicoid tube is made with standard M42 mount and is made with light-weight alloy. The 42mm side is female mount and Fujifilm X-mount side is male mount. It can works as a standard M42 - Fujifilm FX adapter This Helicoid tube offers a total of 32mm movement distance for lens focusing.