Patents: Canon RF 400mm f/2.8L, RF 500mm f/4L, RF 600mm f/4L IS USM Lenses

Canon has filed three super telephoto prime lens patents in Japan, they are RF 400mm f/2.8L IS USM Lens, RF 500mm f/4L IS USM Lens, and RF 600mm f/4L IS USM Lens.

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