Firmware: Updates for the EF 400mm f/2.8L IS III and EF 600mm f/4L IS III are available

Canon has released new firmware for its latest super-telephoto lenses, the EF 400mm f/2.8L IS III USM and the EF 600mm f/4L IS III USM. … Continue reading Firmware: Updates for the EF 400mm f/2.8L IS III and EF 600mm f/4L IS III are available