It's a cutting-edge interchangeable lens with electric-powered zoom operation from the premium lens. Crystallizing Panasonic's optical technologies, the premium lens features superb image rendering for lifelike textures, crisp edge-to-edge contrast, a unique Nano Surface Coating for minimal ghosts and flaring and natural atmospheres with remarkable transparency.The lens system features excellent contrast at entire zoom range. The inclusion of 4 aspherical lenses that helps achieving the downsizing of lens unit also improves optical performance by minimizing distortion. The 2 ED lenses effectively compensates for the chromatic aberration.Panasonic's Nano Surface Coating technology is adopted to minimize the reflection at entire visual light range by applying the extra-low refractive index coating with nano-sized structure on the surface of the lens. It results in the super clear image with dramatic reduction of ghost and flare.Adopting an inner focus system driven by a stepping motor, the superior optical design realizes outstanding smoothness to support the high speed AF system of LUMIX G cameras. By speeding up the aperture control, shutter time lag is also shortened.