RJ Speed Booster lens turbo FOCAL Reducer For NIKON F/G mount Lens NIKON-FX to FUJI FUJIFILM FX X-E1 X-E2 X-T1 X-M1 X100 X100T Speed Booster Focal Reducer Lens Turbo 0.7x Genuine RJ Brand increase speed by 1 stop reduce focal length 0.7x allow adjusting aperture for Nikon G lens (also work with Nikon F lens)