Premium G Lens optical design This 70-350mm (105-525mm full-frame equiv.) super-telephoto zoom lens weighs in at only 22oz. (625g). The advanced G lens design includes an aspherical element and three ED (Extra-low Dispersion) glass elements in a precision optical design suppress aberration throughout the zoom range, including chromatic aberration that can be a problem at super-telephoto focal lengths. Sharp, clear image quality is easy to achieve at all focal lengths, right out to the image edges. Three ED (Extra-low dispersion) glass elements Three ED (Extra-low Dispersion) glass elements take axial chromatic aberration and chromatic aberration due to differences in magnification out of the picture, maximizing resolution and bokeh while leaving precisely rendered edges with no fringing or unnatural coloration, while significantly reducing flare and ghosting. XD Linear Motor for fast, precise, quiet AF Sony's advanced XD (extreme Dynamic) linear motor technology - the same type used in G Master series lenses - focuses on and tracks even fast-moving subjects with outstanding speed and precision. Coupled with the advanced real-time AF capability of the latest compact APS-C bodies, you have a high-performance, easy-handling system for landscapes, wildlife, and more. 7-blade circular aperture contributes to gorgeous bokeh The 7-blade circular aperture maximizes the beauty of this large-aperture prime-lens, contributing to impressive