Northlight has uncovered a USPTO patent for various fast prime optical formulas, included in the patent is the design for an RF 135mm f/1.8L. A lens we definitely think will be released sometime in 2020. Canon RF 135mm f/1.8L USM embodiment: Focal length: 133.0mm F number: 1.80 Half angle of view: 9.2° Image height: 21.6mm … Continue reading Patent: Canon RF 135mm f/1.8L and other fast primes