Just introduced to the Sigma "I series", the 50mm F2 Dg Dn | Contemporary lens is a classic standard prime lens that combines exceptional build quality, robust optical performance, and a compact, fast-aperture design. This lens, the fifth F2 I series lens, joins the ranks of the 20mm, 24mm, 35mm, and 65mm lenses, all of which feature an arc-type Af/Mf switch and a stylized ring on the all-metal barrel. Designed specifically for full-frame mirrorless systems, this Dg Dn lens offers a pleasing tactile experience with its metal lens hood, manual-focus, and aperture ring, all knurled for your comfort. The F2 maximum aperture delivers pleasing bokeh effects, and the optical design ensures results comparable with the 50mm F1.4 Dg Dn | Art lens, but in a much more compact and lightweight lens.The Sigma 50mm F2 Dg Dn | Contemporary lens is resistant to flare and backlighting, and its Af is driven by a stepping motor for fast, reliable autofocus for both still and video use.