S-E2470 18 elements in 16 groups: 3 Aspherical lenses 4 Extra-Low Dispersion lenses 1 Ultra High Refractive Index lensAspherical (ASPH) lenses help reduce size and weight while effectively preventing spherical and distortion aberrations. Extra-Low Dispersion (ED) lenses correct chromatic aberration rendering sharp, high-contrast images with clear colors from corner to corner. Ultra-High Refractive Index (UHR) lens improves optical performance, reduces size and weight and achieves uniform image quality from the center to the edges of the frame. Uncompromising Approach to Creativity With a large aperture creating beautiful bokeh and outstanding edge to edge sharpness across the frame, the LUMIX S PRO 24-70mm F2.8, will be the go-to lens for the visual creative. From works of art to high-contrast, high-res landscapes the 24-70mm F2.8 will be the choice for those who requires control over the depth of field and bokeh, whether shooting cityscapes or impressionist portraits. Moreover, the Manual Focus clutch mechanism plus the linear or non-linear focusing options, when paired with the LUMIX S-series, provide the ultimate control for both stills and video.Meeting the stringent standard LEICA Cameras, the LUMIX S PRO lenses deliver incredible resolution at every focal length and across the frame, make them an uncompromising choice for full-frame mirrorless camera systems. Rugged Design - More Creative Optio