Canon RF 400mm f/2.8L IS USM LensCanon RF 400mm f 2. 8L IS USM Lens Whether youre shooting action from the touchline, wildlife on safari or news events from the press pack, this RF mount super telephoto lens puts you right among the action. Since it works natively with EOS R series cameras, the Canon RF 400mm f 2. 8L delivers exceptional image quality and performance. An f 2. 8 maximum aperture allows shallow depth of field and exceptional low light performance, which is complimented