G-series optical design ideal for HD and 4K moviemaking, Minimized angle of view variation (breathing) while focusing, No focus shifting or axial displacement while zooming, Independent zoom, focus and iris rings for superior control, Constant F4 max aperture maintains exposure / depth of field, Super sonic wave motor drive for quiet variable speed zoom, Silent iris and linear AF drive system for quiet operation, Dust and moisture resistant design for maximum durability, Optical SteadyShot image stabilization for video and stills, Ideal for full-frame, APS-C and super 35 e-mount cameras,