The Carl Zeiss Vario-Tessar T E 16-70mm F4 ZA OSS (SEL1670Z) is a compact zoom lens that provides a 35mm full equivalent focal length range of 24-105mm, covering wide-angle to short telephoto perspectives. A constant f/4 maximum aperture offers consistent performance throughout the zoom range and is especially beneficial when working with greater zoom magnifications in low-light conditions. Also benefitting working in dim light or at the long end of the zoom range is Optical SteadyShot image stabilization, which serves to minimize the appearance of camera shake by up to four shutter speed steps.