Canon Patents Advanced and Intriguing Lens

The RF mount has seen some extreme lens designs, with Canon pushing into new territory with options like the revered 28-70mm f/2L. It seems they have no intention of slowing down, as another interesting design has emerged, this time one sure to please sports and wildlife photographers. A recent Canon patent has emerged for an RF 100-300mm f/2.8 1.4x Extender lens. While such a lens is not unheard of, as both Nikon and Sigma make 120-300mm f/2.8 lenses, this would be the first such full frame with a built-in teleconverter, which would effectively make it a 140-420 f/4 lens when engaged.