1. Difference in the Acronyms Canon USM Lens The STM is the acronym for Stepper Motor, and USM stands for Ultrasonic Motor. A Canon STM lens use a stepper motor for autofocusing. The Canon USM lens uses an Ultrasonic motor for autofocusing. 2. Noise Factor Canon USM Lens 50mm The USM lenses from Canon produce slight noise during the autofocusing.

I am mainly debating between the RF 24-240mm f/4.5-6.3 IS USM, vs RF 24-105mm f/4-7.1 STM + RF 100-400mm f/5.6-8 IS USM. Locally, the price for either kit would be about the same ($900). I generally like the RF 24-240 as a walk-around do-everything lens. The much better and faster focusing is a big advantage over the 24-105 STM.
Aug 24, 2020 Canon RF 600mm F11 IS STM sample gallery: 38 images Aug 24, 2020 Tamron 24mm F2.8 Di III OSD M1:2 sample gallery: 24 images Aug 18, 2020 Nikon AF-S Nikkor 120-300mm F2.8E FL ED SR VR sample gallery: 43 images
Compare Canon RF 24-105mm f 4 L IS USM Lens vs Canon RF 24-105mm f 4-7.1 IS STM Lens vs Canon RF 24-70mm f 2.8 L IS USM Lens vs Nikon NIKKOR Z 24-70mm f 2.8 S Lens Press ‎ ↵ Enter ‎ for Accessibility for blind people who use screen readers So I jumped from a t5i to a 6D2, and got the 24-105 lens as part of the kit. I bought the 50mm prime when the t5i was my only camera, and I thought it was much better IQ that the 17-55mm kit lens that came with it. Everyone seems to rave about the 50mm 1.8's image quality, that it is excellent. B

It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject. Has rounded aperture blades. Canon EF 24-105mm F4L II USM. Canon RF 24-105mm f/4-7.1 IS STM. Similar to the number of aperture blades, rounded blades affect the way the light gets through to the sensor.

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canon rf 24 105 stm vs usm