Features and Functions: Full-Frame Format | f/2.8 to f/22 Stepping AF Motor Internal Focus and Zoom Design Weather-Sealed Construction Rounded 9-Blade Diaphragm Description: The Sigma 16-28mm f/2.8 DG DN Contemporary Lens is a compact, high-performance ultrawide zoom meant to compliment a photographer's arsenal by providing a versatile range of focal lengths in a small and lightweight package, without compromising on optical quality. A fast f/2.8 constant aperture allows for the use of faster shutter speeds in low-light scenarios as well as being especially useful for closeup shots thanks to its shallow depth of field. This lens utilizes a complex arrangement of specialized aspherical and low dispersion glass elements to effectively suppress chromatic aberrations for improved clarity and color accuracy. Super Multi-Layer and Nano Porous Coatings have also been applied to improve contrast and color rendering by reducing lens flare and ghosting when working in strong lighting conditions. The inner zoom & focus mechanism keeps the dimensions of the lens constant throughout the zoom range and at all focus distances. This design feature allows for almost no balance point shift and a fixed front element, making it an ideal instrument for videography, travel, and landscape photography.Items Included: Sigma 16-28mm f/2.8 DG DN Contemporary Lens (Sony E) Sigma LCF-72 III 72mm Lens Cap Sigma LCR II Rear Lens Cap for Sony E Sigma Lens Hood for 16-28mm f/2.8 DG DN Contemporary Lens