Another world first zoom is the 50-100mm f/1.8 DC HSM Art for DSLRs which provides shooters with an equivalent focal length of 75-150mm, or 80-160mm when used on Canon’s APS-C bodies. Wearing Sigma’s high-end Art title, the 50-100mm aims to deliver excellent optical performance that can rival prime lenses, meaning this one lens can replace three common prime focal lengths: 85mm, 100/105mm, and 135mm. Incorporating Art line innovations, the lens features three F Low Dispersion (FLD) and one Special Low Dispersion (SLD) element as well as one high-refractive index and high-dispersion glass element to keep aberration to an absolute minimum. All this combines nicely with the fast and constant f/1.8 for shallow depth-of-field effects with high resolution.
The 50-100mm lens also features a redesigned and improved Hyper Sonic Motor (HSM) that is 30% slimmer for fast and accurate movements. It also has a polycarbonate diaphragm made with fluorine and blades that feature carbon feather film for smooth and consistent operation. Another professional design element of the lens is the internal focusing and zoom operation, meaning the lens does not extend or retract during use, preventing intrusion of water and dust as well as ensuring proper balance. Additionally, it has a tripod foot for stability when using a support system and will be available in Canon EF, Nikon F, and Sigma SA mounts.
