The Canon EF 24-105mm f/3.5-5.6 IS STM Standard Zoom Lens is the first Canon EF standard zoom lens for full-frame sensor cameras to include a lead screw-type stepping motor (STM) for smooth and quiet AF and tracking while shooting movies or still images. It offers top-notch image quality thanks to two aspheric lenses and a UD lens for sharpness and clarity, optimized lens placement and advanced coatings that reduce ghosting and flare while delivering remarkable color balance; and a 7-blade circular aperture diaphragm that creates gorgeous, soft backgrounds. The lens is compact, has an advanced image stabilization system for up to four stops of compensation and offers full time manual focus. With full-frame compatibility, outstanding STM AF performance and covering a popular zoom range, the EF 24-105mm f/3.5-5.6 IS STM is an excellent choice. The focusing mechanism employs an inner focus lens, a stepping motor and lead screw to support the Canon EOS Movie Servo AF function and provide smooth and quiet continuous AF during video recording, as well as when shooting photos.