Thanks to a 9-blade circular aperture, this Sony 20–70 mm G lens produces beautiful bokeh effects with background blur at a constant aperture of f/4. Two sophisticated XD (Extreme Dynamic) linear motors enable faster and more accurate focusing when shooting videos and photos. With this ultra-wide-angle lens offering a standard zoom range, you’ll never miss a shot again.Two powerful XD (Extreme Dynamic) linear motors provide fast, quiet and smooth autofocus. Improved drive efficiency (compared to Sony’s SEL2470Z, under test conditions) ensures AF is up to 60% faster, whilst tracking performance has doubled, making tracking reliable and precise.