"Standard lens" that matches the optical performance standards set by the Sigma Contemporary line of lenses.Sigma I series lenses are developed around the concept of "Compact everyday lenses with outstanding image quality" and the Sigma 50mm F2 Dg | Contemporary is exactly that. It features high-quality optics in a compact size, perfect for a wide variety of photographic styles. Built from the ground up for mirrorless cameras, the Sigma 50mm F2 Dg | Contemporary is constructed using a single Sld glass element and three aspherical lens elements that are excellent at correcting various types of aberration for clear, high-definition images.The conflicting ideals of improving optical performance while reducing body size and weight are achieved through the latest optical design, and the processing and production technologies at Sigma's only production facility in Aizu.