"Hyper-Sonic Motor", either in-lens ultrasonicmotor or micro-motor, analogous to Nikon SWM (AF-S) (ultra-sonic or micro-motor), Canon USM (ultrasonic or micro-motor)
The Nikon F-mount is a type of interchangeable lens mount developed by Nikon for its 35mm format single-lens reflex cameras. The F-mount was first introduced
The Sigma 12-24 has low distortion even compared to less wide zooms like the Canon EF 16-35mm lens. This lens is available in Canon, Nikon, and Sigma, Pentax