There’s a dual ring-type ultrasonic autofocus system ... the versatile Canon RF 100-500mm F4.5-7.1L IS USM zoom lens gives even greater reach in a much more compact, lightweight, and relatively ...

are ensured by a ring USM(Ultrasonic Motor) and inner focusing system. Extenders EF1.4X and EF2X are compatible with this lens with manual focusing." ...

This lens delivers sharp and crisp performance throughout the entire zoom range. Its ring USM (Ultrasonic Motor) drive and inner focusing contribute to silent and fast AF, full-time manual ...