The smallest mid-tele lens in its classWhile retaining the compact, lightweight, and outstanding image quality concepts of the Contemporary line, thanks to Sigma's leading-edge technology, this lens provides the amount of bokeh and admirable brightness expected from F1.4 lenses even in the mid-tele range. This addition completes the large aperture series comprised of portable wide-angle, standard, and telephoto lenses.Impressively compact construction with image quality rivaling Sigma's Art lineTo achieve such a compact construction, lens design is considered based on the capabilities of the camera body function to correct peripheral light amount and distortion. Moreover, axial color aberration, which is difficult to eliminate by image processing, is efficiently corrected by incorporating an Sld glass element. A compactness and lightweight construction combined with superb image quality is achieved.F1.