Ultra-wide F2.8 12-24mm zoomAt the 12mm end of its range, this 12-24-mm constant F2.8 zoom lens offers an ultra-wide angle of view. An innovative optical design works with Sony's advanced XD Linear Motors to deliver outstanding G Master image quality in a lightweight lens that also features fast, precise autofocus, smooth control, and solid reliability.New optics with the largest XA elementThree XA (extreme aspherical) elements, including the largest ever made for any Alpha lens, combine with one aspherical element in an innovative optical design that achieves stunning G Master resolution throughout the image area.Minimal aberration enhances sharpnessTwo Super ED (Extra-low Dispersion) and three ED glass elements suppress chromatic aberration that can degrade resolution in this type of large-aperture lens, ensuring that color smearing does not occur anywhere in the image area so that maximum sharpness is maintained throughout.Crisp images in difficult lightA new Nano AR Coating II that can be evenly applied to large lens elements or highly curved element surfaces has been developed to suppress internal reflections that can cause flare and ghosting for clear, crisp imagery. Despite the lens's wide angle of view, Nano AR Coating II maintains high clarity and contrast throughout the entire image, even in difficult light. ( [A] Conventional coating [B] Nano AR Coating II [1] Conventional coating [2] Nano AR Coati