Canon RF 500mm f/4L IS lens is rumored to be in the works. The lens will be the first super telephoto prime glass in RF-series lens lineup. In the past, Canon tends to announce super telephoto prime lenses in pairs, so it is a possibility to expect another one like RF 300mm f/2.8L IS USM Lens.
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https://www.dailycameranews.com/2019/05/canon-rf-500mm-f-4l-is-lens-first-rf-mount-super-telephoto-prime/