Effortless FreedomA high performance compact ultra-wide zoom with a constant F2.8 aperture. Uncompromising optical performance within a compact body Convenient form-factor allowing more freedom and usability Exceptional build quality with intuitive ergonomicsThe full-frame SIGMA 16-28mm F2.8 DG DN | Contemporary combines exceptional optical quality, a bright F2.8 constant aperture and a robust and lightweight body, opening up new possibilities for L-mount shooters who need professional results in a compact package.With its excellent field curvature correction, the 16-28mm F2.8 DG DN | Contemporary is able to achieve exceptional edge-to-edge sharpness, which is essential for most wide-angle applications. It boasts five FLD elements and four aspherical lens elements to ensure optimal image quality with minimal aberrations. The lens has an inner zoom mechanism that keeps overall length consistent throughout the entire zoom range, helping it feel balanced in the hand. The inner zoom also means the lens' center of gravity stays fairly constant, so it's perfect for gimbal use. A front filter thread allows filters to be attached more easily.The lens boasts an exceptionally compact form-factor, weighing in at just 450g and measuring just 100.6mm in length, which makes it a highly practical optic that is portable enough for everyday shooting. It's especially appealing for landscape, wedding and travel photographers wh