The Sigma 135mm f/1.8 ART DG HSM Lens is a medium range telephoto prime lens designed for modern high megapixel DSLRs. A 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 large f/1.8 aperture allows for more creative control over imagery. A stunning compression effect makes the Sigma 135mm f/1.8 Art the ideal portrait lens while its large aperture helps with event photography and much more. Handcrafted in Japan.