Canon RF 400mm F2.8L IS USM and RF 600mm F4L IS USM Offer Faster AF and Better OIS
(Photography Blog)

The Canon RF 400mm F2.8L IS USM and RF 600mm F4L IS USM are two new super telephoto lenses that offer incredible focusing speeds. Optically identical to the EF versions, the RF 400mm and 600mm both feature a double power drive method that helps you keep track of action, even when shooting at 30fps with the equally new EOS R3 camera. The new RF lenses are about 40g heavier than the EF versions but offer faster autofocusing, full-time manual focus and an improved 5.5-stops of OIS. The Canon RF 400mm F2.8L IS USM is priced at £12,449 / €14,179 and the RF 600mm F4L IS USM will cost £13,409 / €15,269.