Thank you for using Canon Products.
Please be informed of the information outlined below regarding firmware for the EF400mm f/2.8L IS III USM and EF600mm f/4L IS III USM interchangeable lenses for digital SLR cameras.
We would like to offer our sincere apologies to users who have been inconvenienced by this issue. Going forward, we will spare no effort in our quality management to make sure our customers can use our products with confidence.
EF400mm f/2.8L IS III USM and EF600mm f/4L IS III USM
Note: The firmware version 1.0.8 is for lenses equipped with firmware version 1.0.7. The lens firmware version can be checked via the camera’s menu.
Firmware version 1.0.8 incorporates the following correction.
Corrects the phenomenon whereby, during movie shooting, when attached to certain EOS digital SLR cameras*1 with the camera’s shooting mode set to M or Av mode, some exposure flicker may happen.
Note: This phenomenon doesn’t occur when shooting still images.
Cameras that can be used to run the lens’ firmware update (as of March 2019):
EOS-1D X Mark II, EOS-1D X, EOS-1D C, EOS 5Ds, EOS 5DsR, EOS 5D Mark IV, EOS 5D Mark III, EOS 6D Mark II, EOS 6D, EOS 7D Mark II, EOS 80D, EOS 70D, EOS 800D, EOS 750D, EOS 700D, EOS 650D, EOS 200D, EOS 100D, EOS M50, EOS M6, EOS M5, EOS M3, EOS M2, EOS M, EOS M100, EOS M10, EOS R, EOS RP
Note: To use an EOS R or EOS M series camera to update the lens’ firmware, a mount adaptor is required.
The firmware is available for download on Canon website.
Contact Information for Inquiries:
Please contact your nearest service centre if you have any queries.
*1 EOS-1D X Mark II, EOS-1D X, EOS-1D C, EOS-1D Mark IV, EOS 5D Mark IV (Ver.1.0.2 or later), EOS 5D Mark Ⅲ, EOS 5D Mark II, EOS 5Ds, EOS 5Ds R, EOS 7D Mark II, EOS 7D, EOS 6D, EOS 80D, EOS 70D, EOS 60D, EOS 60Da, EOS 760D, EOS 750D, EOS 700D, EOS 650D, EOS 600D, EOS 550D, EOS 100D, EOS 1500D, EOS 1300D, EOS 1200D, EOS 1100D, EOS M, EOS M2