Canon STM lenses have very quiet autofocusing making them great for video but are slower at getting focus compared to USM lenses. STM has to do with Stepper Motor technology, and the power comes from the camera body, not from the lens itself. The Canon STM system was developed specifically for filming video.
Compare Canon RF 24-105mm f 4 L IS USM Lens vs Canon RF 50mm f 1.8 STM Lens Canon RF vs Canon RF 24-240mm f 4-6.3 IS USM Lens
has a silent focus motor built into the lens. Canon RF-S 18-150mm f/3.5-6.3 IS STM. Canon RF-S 55-210mm f/5-7.1 IS STM. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance.
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Has full-time manual focus. Canon EF 85mm F/1.8 USM. Canon RF 85mm f/2 Macro IS STM. With full-time manual focus, you can move the focus ring whilst it is in AF (autofocus) mode. This means that you can make manual adjustments once the AF has finished, without changing to manual mode.Compare Canon RF 50mm f 1.2 L USM Lens vs Canon RF 24-105mm f 4-7.1 IS STM Lens vs Canon EF-M 32mm f 1.4 STM Lens 96IHu.