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.
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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. Lenses with a built-in focus motor can autofocus even if the camera does not have its own focus motor. Has full-time manual focus. Canon EF 50mm F/1.8 STM. Canon RF 50mm f/1.8 STM. With full-time manual focus, you can move the focus ring whilst it is in AF (autofocus) mode.
In 2020, Canon introduced seven new RF mount lenses: RF 24–105mm f /4–7.1 IS STM; RF 600mm f /11 IS STM — fixed-aperture lens; RF 800mm f /11 IS STM — fixed-aperture lens; RF 85mm f /2 MACRO IS STM — 0.5× maximum magnification; RF 50mm f /1.8 STM; RF 70–200mm f /4 L IS USM; RF 100–500mm f /4.5–7.1 L IS USM; In 2021, Canon
has a silent focus motor built into the lens. Canon EF 500mm F/4L IS II USM. Canon RF 800mm f/11 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.
What is the difference between Canon EF 24-105mm F4L II USM and Canon RF-S 18-150mm f/3.5-6.3 IS STM? Find out which is better and their overall performance in the camera lens ranking. gf5DPs.