Sigma 135mm, medium range telephoto prime lens ideal for weddings, events, portrait, sports and action photography. Full-frame lens with APS-C compatibility. The new large Hyper Sonic Motor (HSM) gives ample torque to the focussing group for outstanding speed, promising stable performance even at lower speeds. Stunning compression effect helps in portrait while its large aperture makes it ideal for events and other purposes. Dust and splash proof mount performs well in any condition. While large aperture helps in more creative control. Also an incredible landscape lens and its designed and compatible with modern high megapixel DSLRs.