What is the difference between usm lens and stm lens

The difference between usm lens and stm lens is: 1. USM lens achieves focus by driving the movement of lens elements, while STM lens achieves focus through tiny step motion; 2. USM lens usually uses ring ultrasonic wave The motor can achieve full-time manual focus, while the STM lens uses a linear motor or a hybrid motor, which requires electronic signals to achieve manual focus; 3. USM lenses are usually larger and heavier, while STM lenses are lighter.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

USM lenses and STM lenses are two different autofocus motor technologies, and they have some differences in functions and applications.

USM is an ultrasonic motor (Ultrasonic The abbreviation of "Motor" is an autofocus technology developed by Canon. The USM motor uses the principle of ultrasonic vibration to achieve focusing by driving the movement of the lens element. This motor technology is characterized by high speed, high precision and low noise, making it suitable for shooting fast-moving subjects such as sports, wildlife and sports. The USM lens has fast focusing speed and accurate focusing, making it suitable for shooting scenes that require fast focusing.

STM is a stepping motor (Stepping The abbreviation of "Motor" is an autofocus technology launched by Canon in recent years. The STM motor uses precise stepper motor control to achieve focus through tiny step movements. This motor technology is smooth, quiet and precise, making it suitable for shooting video and still images. The focusing speed of STM lenses is relatively slow, but the focusing process is smooth, making it suitable for shooting scenes that require continuous focus.

In addition to differences in focusing speed and application fields, there are also some structural differences between USM lenses and STM lenses. USM lenses usually use a ring-shaped ultrasonic motor, with the motor part located inside the lens, allowing full-time manual focus. STM lenses use linear motors or hybrid motors. The motor part is located outside the lens and requires electronic signals to achieve manual focus.

In addition, USM lenses are generally larger and heavier, suitable for professional photographers and high-end photography enthusiasts. The STM lens is lighter and suitable for entry-level and daily shooting.

In short, USM lenses and STM lenses are two different autofocus technologies, suitable for different shooting scenarios and needs. USM lenses are suitable for scenes that require fast focus, while STM lenses are suitable for scenes that require smooth focus. Choosing the right lens depends on your individual shooting needs and budget .

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