The Metabones F-Mount to Fujifilm X-Mount Lens Adapter mounts F-Mount lenses on a Fujifilm X-Mount camera body. It carries no optical elements, so focal length, maximum aperture and image circle are unchanged. An aperture ring on the adapter sets the diaphragm, which keeps a lens with no aperture ring of its own controllable. A tripod foot carries the weight of the lens instead of hanging it off the camera mount.