The FotodioX Pro TLT ROKR Tilt-Shift F-Mount to L-Mount Lens Adapter mounts F-Mount lenses on an L-Mount camera body. It carries no optical elements, so focal length, maximum aperture and image circle are unchanged. It tilts 10° to swing the plane of focus and shifts ±10mm to correct converging verticals, movements the lens itself does not provide. An aperture ring on the adapter sets the diaphragm, which keeps a lens with no aperture ring of its own controllable.