Outstanding Zoom Lens Maneuverability

Thanks to SIGMA’s inner focus and inner zoom technologies, adjusting the focus and zoom rings on the SIGMA 50-100mm F1.8 DC HSM Art Lens for SIGMA SA does not change the length of the lens, and turning the zoom ring is not prone to cause focus shift.

Rounded Diaphragm

The 9-blade rounded diaphragm creates an attractive blur in the out-of-focus areas of the image.

Featuring A Newly Designed Hyper Sonic Motor

To achieve outstanding image quality and F1.8 brightness, SIGMA has enhanced its Hyper Sonic Motor (HSM). Optimizing the layout as well as the shapes of the individual parts, SIGMA has made the HSM 30 percent slimmer than before. In turn, this slimmer HSM has made possible the combination of F1.8 brightness and high image quality in a zoom lens. As with the previous SIGMA HSM, at any time during AF, users may access MF simply by rotating the focus ring. This feature makes faster focus adjustment possible, since there is no need to use the AF/MF focus mode switch. Also, the optional SIGMA USB DOCK allows the user to set the lens to conventional full-time manual focus override.