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Continue to ChatPatent: Canon RF 300mm f/2.8L IS 1.4x plus other supertelephoto optical designs https://www.canonrumors.com/patent-canon-rf-300mm-f-2-8l-is-1-4x-plus-other-supertelephoto-optical-designs/
Patent: Canon RF 300mm f/2.8L IS 1.4x plus other supertelephoto optical designs https://www.canonrumors.com/patent-canon-rf-300mm-f-2-8l-is-1-4x-plus-other-supertelephoto-optical-designs/