50mm focal length
75mm equivalent focal length on APS-C cameras, 80mm equivalent focal length on Canon APS-C cameras
F1.4 maximum aperture; F16 minimum
Ring-type ultrasonic-type AF motor with full-time manual focusing
0.4m/15.7" minimum focus
Available in Canon EF, Sony Alpha, Sigma SA, Nikon F (FX) mounts
Aperture Range: f/1.4 to f/16.
Hyper Sonic AF Motor.
Three Special Low Dispersion Elements.
Floating System & Large Diameter Design
Compatible with Sigma USB Dock.