Key Features High resolution & beautiful bokeh 9-blade aperture F4 maximum exposure Dust & moisture resistant Focus breathing feature Incredibly Sharp One ED (Extra Low Dispersion Aspherical), three ED, two AD (Advanced Aspherical) and one aspherical element ensure outstanding resolution in this constant F4 aperture G standard zoom lens, delivering high corner-to-corner resolution and beautiful bokeh. This is an excellent Sony full-frame lens for content creation, stills photography and videography. Beautifully Smooth Backgrounds A circular 9-blade aperture on this Sony G 20-70mm lens creates beautiful circular background bokeh defocus effects with a constant F4 aperture. Fast & Precise Autofocus Two XD (Extreme Dynamic) Linear Motors with their complex construction deliver faster, more accurate focusing for filmmaking and photography. You won't miss a shot with this ultra wide standard zoom camera lens. Bright In All Weathers A constant F4 maximum aperture throughout the zoom range keeps the brightness even when the focal length changes. The front element on this Sony G lens features a fluorine coating that repels water, oil and other contaminants, while making it easy to wipe off any dust or fingerprints. Professional Ergonomics A dust- and moisture-resistant design, along with versatile controls, makes this Sony G lens ideal to use in the most difficult scenarios—both indoors and outdoors. The focus breathing feature is also compatible on this ultra wide angle standard zoom lens. Built For The Future Sony lenses allow you to take full advantage of your next Sony camera's features.