Canon Patent: 200-400mm F4 x 1.4 & 200-500mm F4 x 1.4 Lenses For RF Mount
A new Canon patent application for two RF-mount telephoto lenses with extender: 200-400mm F4 x 1.4 and 200-500mm F4 x 1.4. Canon patent application P2022185663 (Japan, published 12/15/2022) discusses optical…