LUMIX S PRO CAMERA LENS - 50mm fixed focal F1.4 L-mount lens, LEICA certified for LUMIX S Series Full-Frame L Mount mirrorless cameras LENS ELEMENTS - 13 lenses in 11 groups; 2 aspherical lenses and 3 ED (Extra-low Dispersion) lenses effectively suppress both axial chromatic aberration and chromatic aberration of magnification LENS FOCUSING - A double focus system combines a linear motor and stepping motor to achieve sensor drive at a maximum speed of 480 fps for fast, high-precision autofocus LENS FILTER SIZE - 77mm diameter filter with an 11-blade circular aperture diaphragm