RIBCAGE: YI 4K INSTALLATION GUIDEwww.back-bone.ca | support@back-bone.ca222-11 M12 Lens mountingIf you wish to use M12 lenses you can now add the reversible M12 mount. Insert it with the longersocket going into the camera for short lenses, or turn it around and screw it in with the socket extendingout for lenses that need extra room.To remove the M12 mount when it’s fully inserted into the camera, simply align the circular key with thegroves in the mount. Use a coin such a quarter to unscrew it from the faceplate. The circular key canalso act as a protective cover for the camera when the M12 mount is not present. Simply screw it intothe opening.