High-Speed Autofocus
High-speed autofocus for shooting stills and smooth, near-silent autofocus when shooting video are achieved by incorporating NANO USM technology.
The EF 70–300mm f/4–5.6 IS II USM's NANO USM technology delivers quick, near-silent autofocus whether you're capturing an athlete jumping for a ball or recording wildlife in their natural habitat. For still images, it provides high-speed autofocus to help ensure you get the shot you want. When recording videos, the near-silent operation keeps unwanted noise out of your videos. For additional artistic control, manual focus is also possible even when the lens is set for autofocus. This means that when recording a video, for example, you can slowly pull in or out of focus for a dramatic effect.