New Canon patents reveal THREE possible RF lenses with built-in teleconverters

Canon RF teleconverter lens patent
(Image credit: Canon)

Canon is clearly going all-in on expanding its RF-mount lens range. Judging by recent patents, we might get at least one native RF-mount telephoto lens with a built-in teleconverter. According to Japanese patent 2022142979, published October 3rd, Canon is considering not one but possibly three such lenses: a 300mm f/2.8, 400mm f/2.8 and 600mm f/4, each with a built-in teleconverter.

The (translated) wording of the patent is much more general, describing the feature as: "An object of the present invention is to provide an optical system having a variable power optical system that is inserted into and removed from a main optical system, and to achieve good optical performance while reducing the weight of the entire system."

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Ben Andrews

Ben is the Imaging Labs manager, responsible for all the testing on Digital Camera World and across the entire photography portfolio at Future. Whether he's in the lab testing the sharpness of new lenses, the resolution of the latest image sensors, the zoom range of monster bridge cameras or even the latest camera phones, Ben is our go-to guy for technical insight. He's also the team's man-at-arms when it comes to camera bags, filters, memory cards, and all manner of camera accessories – his lab is a bit like the Batcave of photography! With years of experience trialling and testing kit, he's a human encyclopedia of benchmarks when it comes to recommending the best buys.