A New Lens from Canon Might Challenge Sony and Nikon

A few weeks ago, we reported on the possibility of a new fixed-aperture telephoto lens from Canon. Shortly after, Canon announced their RF mount 100-300mm F2.8 L IS USM lens. Canon sports, wildlife, and fashion photographers everywhere would have taken a keen interest in this. Sadly it didn't include the expected built-in teleconverter that could have let the lens double as a 140-420mm f4 lens. And given the news you're about to read, I can see why they deliberately left it out of that lens. Fro...