Sony Alpha E-Mount FE 24-70mm f/4.0 ZA OSS Zoom Lens A compact mid-range zoom that delivers outstanding performance for full-frame format E-Mount cameras. This compact full-frame Sony FE 24-70mm F4 ZA OSS covers a 24mm to 70mm range with a constant maximum aperture of f/4, enabling consistent exposure settings at any focal length. The FE 24-70mm is a premium lens that can deliver superlative image quality with full-frame E-mount cameras, and dust/moisture resistance means consistently reliable performance. Five aspherical elements and one ED glass element in a state-of-the-art optical path suppress aberration for outstanding clarity and beautiful rendering throughout the zoom range. The acclaimed Carl Zeiss T* coating controls reflections for superior contrast, and a circular aperture creates smooth background bokeh with natural highlights. Key Features: Constant F4 maximum aperture throughout the zoom range A constant F4 maximum aperture throughout the zoom range allows the user to use optimum exposure parameters that will create the desired look at any focal length. The ability to use F4 at the telephoto end of the zoom range also reduces the need to use high ISO settings, and allows the use of high shutter speeds to capture action when necessary. A circular aperture design helps to deliver smooth background defocusing. A compact mid-range zoom that delivers outstanding performance This compact, high-performance 35mm full frame format mid-range zoom lens has been specifically designed bring out the full performance potential of the Alpha series full frame E-mount bodies.