What does USM lens mean?

What does USM lens mean?

If you notice your Canon digital SLR camera lens has the letters USM written on the side, it means the lens has a small motor built into the body. Hence, USM is short for UltraSonic Motor. What this means is that your lens will autofocus faster than standard models.

IS STM vs USM?

USM stands for Ultrasonic Motor, while STM stands for Stepper Motor. … By comparison, the STM lenses really are almost silent, as they were built with video in mind — rodents need not apply. Their focus speed, while a tiny bit slower, is also better suited for video as it's smoother and less “jarring.”

What is the difference between USM and is in Canon lenses?

USM works on the autofocus mechanism of the lens while the IS compensates for the motion of the camera by moving the lens element inside. USM, which stands for Ultrasonic Motor, is an alternative way of moving the lens element inside in order to bring the subject into focus.

WHAT IS II lens?

The 18-55 IS II will only mount on APS-C (1.6x FOVCF) Canon EOS DSLR Cameras. On these cameras, the 18-55mm focal length range provides the equivalent of a 28.8-88mm lens on a full frame DSLR. … The Canon EF-S 18-55mm f/3.5-5.6 IS II Lens is a relatively "slow" lens – meaning that it has a relatively narrow aperture.