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Feb 19, 2016 · Canon's Nano USM focusing motors have so far been used in the EF 18-135mm f/3.5-5.6 IS USM and EF 70-300mm f/4-5.6 IS II USM lenses. It is a type of AF motor that, like Ring USM, uses micro-piezo vibrations to move the lens focus elements.
Compared to my big, beloved EF 100-400mm f/4.5-5.6L IS II, this RF 100-400 is just as spectacularly sharp and focuses as blindingly fast, and the RF lens is less than half the weight (635g versus 1,550g) and less than one-third the price ($649 versus $2,399)!
Nov 23, 2021 · The RF 100-400mm joins a powerful yet easily manageable pair of RF 600mm F11 IS STM and RF 800mm F11 IS STM primes, along with the more pro-spec Canon RF 100-500mm f/4.5-7.1 IS USM zoom lens.
Nov 10, 2011 · What does this mean, and why or why do I not want it? USM uses Ultrasonic wave to move the lens quicker to achieve more precise focusing. Unlike the traditional old fashion magnetic lens, USM is quieter and less friction during the lens movement, thus it does not waste energy/battery by creating human audible noise.
Sep 19, 2006 · Ring USM also has another advantage - full-time manual focussing or FTM in which, once auto-focus has completed, the lens focus can be "touched up" using the manual focus ring without having to switch the lens from AF to MF.
The Canon ultrasonic USM technology is recognized for its quick, precise, and quiet autofocus operation. This makes USM lenses particularly suitable for photography and videography where speed, accuracy, and low noise are essential.
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The RF 100-400mm f/5.6-8 IS USM is a lens many owners of Canon’s EOS R cameras have been waiting for. Although not particularly fast, it has a winning combination of light weight, easy handling, sharp focusing and a competitive price tag.
