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Canon Patent: RF 300mm F/2.8 IS And RF 400mm F/2.8 IS

Canon Patent: RF 300mm f/2.8 IS And RF 400mm f/2.8 IS

And yet another Canon patent application: two telephoto fast primes for the RF mount. Canon patent application 2023104022 (Japan, published 7/28/2023) discusses optical formulas for two fast telephoto prime lenses…

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