The lens's internally focusing, internally zooming construction optimizes it for video shooters who intend to mount it on a gimbal. Two floating focus Nano USM motors drive the Dual Pixel CMOS autofocus and can operate independently of one another, resulting in fast and quiet autofocus that also benefits video. The construction also suppresses focus breathing, maintaining the integrity of the image as you move through the zoom range, and a manual, lockable iris ring ensures the integrity of the exposure as you shoot.