Although they share much the same optics, mechanics, electronics and firmware as their EF stablemates (the Canon EF 400mm f/2.8L IS III USM and EF 600mm f/4L IS III USM), the RF versions of these classic lenses have a key advantage: the RF mount itself. With 12 electrical contacts – four more than the EF mount – communication between the camera and the lens is much faster and higher-bandwidth, unlocking a new level of performance.
Motorsports photographer and Canon Ambassador Vladimir Rys recently got to grips with the two RF super-telephoto lenses on a rally car shoot with the Canon EOS R3. Vladimir is no stranger to the EOS R System, as he usually uses a Canon EOS R5 – paired with either a Canon RF 50mm F1.2L USM lens or a Canon RF 85mm F1.2L USM – alongside his Canon EOS-1D X Mark III when covering events.
You might also like to read: