The Sigma 135mm f/1.8 DG HSM Art Lens for Nikon F is a medium range telephoto prime lens designed for modern high megapixel DSLRs. A new large Hyper Sonic Motor (HSM) delivers ample torque to the focusing group for outstanding speed, ensuring exceptionally stable performance even at lower speeds. This state-of-the-art prime lens touts a dust and splash proof mount for guaranteed performance in any condition and its large 1.8 aperture allows for more creative control over imagery. A stunning compression effect makes the Sigma 135mm F1.8 Art the ideal portrait lens while its large aperture help with event photography and much more. Like each and every Global Vision Lens, the Sigma 135mm F1.8 DG HSM Art is handcrafted at our single factory in Aizu, Japan and undergoes individual evaluation before leaving Sigma's facility. Boasting outstanding sharpness and great IQ from edge to edge, the 135mm F1.8 Art lens enters the market as Sigma's new premiere mid-range telephoto prime lens. Ideal for events such as concerts, indoor sports, conferences and press events, the 1.8 F-stop delivers greater "shallow depth of field" and isolation of subjects. The outstanding compression effect makes it equally as powerful for up-close and full-length portraits. Its new large hyper sonic motor (HSM) provides ample torque to the focus group for optimal speed while the acceleration sensor detects the position of the lens for compensation focus groups for factors including gravity, producing faster and more responsive AF. Equipped with a focus limiter, the 135mm F1.8 Art can be easily optimized for a variety of distances and situations.Boasting outstanding sharpness and great IQ from edge to edge, the 135mm F1.8 Art lens enters the market as Sigma's new premiere mid-range telephoto prime lens. Ideal for events such as concerts, indoor sports, conferences and press events, the 1.8 F-stop delivers greater "shallow depth of field" and isolation of subjects. The outstanding compression effect