Canon Patents Another Extreme Lens Design

Ever since the arrival of the RF mount, Canon has shown they are willing to push the boundaries of lens design to new levels. It seems they don't plan to slow down, with two new patents emerging, including one for a 300mm f/2.3 mirror lens with autofocus. Mirror lenses achieved some level of popularity several decades ago by providing an affordable way for photographers to enjoy supertelephoto focal lengths in a relatively small package.