The Sigma 20mm F1.4 DG HSM Art lens is designed to bring out the full potential of ultra-highmegapixel DSLR cameras. It incorporates both â€œFâ€ Low Dispersion (FLD) glass, and Special Low Dispersion (SLD) glass in a design of 15 elements in 11 groups. The combination of advanced optics and optimized lens power distribution minimizes spherical aberration, axial chromatic aberration and field curvature. An optimized autofocus (AF) algorithm enables smooth, fast, and accurate focusing and the lens is resistant to strong incidental light sources such as backlight with its Super Multi-Layer Coating. Its thermally Stable Composite (TSC) compound material has a high affinity to metal parts, consistently performs well at extreme temperatures, and reduces the size and weight of the lens. A new metal lens cap (LC907- 02) is also available as a separate accessory. Available in late November, the lens comes in Sigma, Canon and Nikon mounts. For further details, go to www.sigmaphoto.com or follow the company on Twitter, Instagram and Facebook.