Canon has filed new patents in Japan. These applications are for three super telephoto prime lenses named as RF 400mm f/2.8L IS USM Lens, RF 500mm f/4L IS USM Lens, and RF 600mm f/4L IS USM Lens.
We already know that the first super telephoto prime glass in RF-series lens lineup will be the RF 500mm f/4L. In the past, Canon tends to announce super telephoto prime lenses in pairs, so it is a possibility to expect another one like RF 400mm f/2.8L IS USM Lens. Continue reading “Patents : Canon RF 400mm f/2.8L, RF 500mm f/4L, RF 600mm f/4L IS USM Lenses”