Canon is rumored to introduce a new super-telephoto zoom lens for full-frame mirrorless cameras by 2020. The RF-series lens is expected to be the Canon RF 70-400mm f/4.5-5.6L IS USM, which was previously mentioned in the patent application.
In the range of mirrorless cameras starting with the 30MP EOS R, Canon is trying to expand the system with new RF lenses, and rumored to be working on a new glass with a fixed f/4 aperture after brighter RF 70-200mm f/2.8 (B&H Photo Video/Adorama/Amazon). There is rumor that this lens will be RF 70-400mm f/4.5-5.6L IS USM.
While the Canon RF 70-400mm f/4.5-5.6L IS USM lens offers a wider range in focal length, it will be particularly well-suited for wildlife and bird photography. The source also said to expect it to be about the same size as the recently released Canon RF 70-200mm f/2.8L IS USM.
USM (Ultrasonic Motor) is the most widely used AF motor type in the Canon EF range of lenses. All USM motors convert ultrasonic vibration energy into rotational power to move the lens as a common feature.
Canon Upcoming Cameras 2020
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via: CR
