Full-Frame | f/2 to f/22 Sharp, Compact Prime Fast Internal Focus System I Series Lens Offering a focal length ideally suited for portraiture, street scenes, and all-purpose shooting, the Sigma 50mm f/2 DG DN Contemporary Lens delivers sophisticated optical performance and fast autofocus in a compact and lightweight design. Compact 50mm One of the most versatile focal lengths available, this 50mm lens pairs its normal field of view with a bright f/2 maximum aperture that strikes a balance between a compact design and low-light performance plus control over depth of field. This combination makes the 50mm f/2 an ideal everyday lens for environmental portraiture and landscapes with a narrow-enough field of view to isolate details and subjects within busy scenes. Contemporary Line lens features a compact design that measures approximately 2.75 x 2.75" and a weight of just over 12 oz, making it portable enough for everyday shooting needs without compromising on optics or speed. Internal focusing design pairs with a stepping AF motor for responsive and fast focusing performance that's suitable for both stills and video applications. Optical design includes one SLD element and three aspherical elements, to optimize sharpness and limit aberrations, and a Super Multi-Layer Coating that controls flare and reflections. Rounded 9-blade diaphragm contributes to a smooth and pleasing bokeh quality when employing selective focus techniques. Compatible with AF assist function and lens aberration correction on supported cameras. Dust and splash-resistant construction with a brass bayonet mount for ensured accuracy and durability. In the Box Sigma 50mm f/2 DG DN Contemporary Lens (Sony E) Sigma LCF-58 III 58mm Lens Cap Sigma LCF5801M Magnetic Metal Lens Cap Sigma LCR II Rear Lens Cap for Sony E Sigma Lens Hood for 50mm f/2 DG DN Contemporary Lens