Bright F2.8 maximum aperture from 12 mm to 24 mm The ultra-wide 12-mm angle of view available with this versatile lens makes it possible to emphasize distance and create dynamic perspectives that are beyond the scope of the human eye. Expand your artistic palette with deep, engaging visual imagery. Innovative optics with the largest XA element in any α lens Three XA (extreme aspherical) elements, including the largest ever made, combine with one aspherical element in an innovative optical design that achieves stunning G Master resolution throughout the image area. Two Super ED (Extra-low Dispersion) and three ED glass elements suppress chromatic aberration, and a new Nano AR Coating II minimizes flare and ghosting for clear, crisp imagery. Constant F2.8 brightness 12–24-mm zoom with a constant F2.8 maximum aperture is ideal for shooting night scenes, starry skies, and other low-light subjects at low sensitivities without having to use extremely slow shutter speeds. Ultra-wide angles and large aperture in a small, lightweight zoom An advanced optical design with four aspherical elements, including three XA types, plus a mechanical design that features Sony's original XD linear motors, in a compact, lightweight 12–24-mm constant F2.8 zoom that delivers stunning image quality. In addition to being ideal for landscapes, night scenes, and architecture, this lens provides extra mobility for active sports photographers shooting wide angles. XD Linear Motors for fast, accurate AF and reliable tracking Four XD Linear Motors, two for each of the lens's focus groups, contribute to fast, precise autofocus and tracking that make full use of the speed potential provided by high-performance α camera bodies. New control algorithms maximize the response of the XD Linear Motor system while achieving flawless synchronization between the focus groups. Operation is also quiet with minimal vibration.