Unprecedented image qualityThe FE 70-200mm F2.8 GM OSS II delivers superb Image quality throughout the zoom range at all focusing distances with two aspherical elements and one XA (extreme aspherical) element to ensure high resolution throughout the image area. Two ED (extra-low dispersion) glass elements, two Super ED glass elements and one ED aspherical element to minimize chromatic aberration while Sony's Nano AR (anti-reflective) Coating II subdues flare and ghosting. For additional reach, high-performance 1.4x and 2x teleconverters are available (sold separately).Exquisite G Master bokehBeautiful G Master bokeh is achieved through advanced optical design, an F2.8 aperture, and a new 11-blade circular aperture unit. An XA element manufactured to 0.01-micron surface precision suppresses onion ring bokeh and the new aperture unit helps to deliver natural circular bokeh. Close-up bokeh is superb too, with a minimum focusing distance of just 1.32 ft (0.4 meters) at 70mm and 2.69 ft (0.82 meters) at 200mm.Fast, precise AF supports creative shootingFour of Sony's original XD (Extreme Dynamic) Linear Motors, two for each of the lens's focus groups, deliver high thrust efficiency that boosts AF speed by up to 4x compared to the previous model for fast, precise continuous autofocus and tracking for stills and movies. AF tracking while zooming is improved by approx. 30% which greatly increase chances of getting the shot even with sub