Firmware Notice: EF 400mm f/2.8L IS III USM and EF 600mm f/4L IS III USM: Firmware Version 126.96.36.199
Thank you for using Canon products.
Firmware Version 188.8.131.52
incorporates the following fix:
Corrects the issue where exposure flicker may occur during movie shooting when the EF 400mm f/2.8L IS III USM lens with Firmware Version 1.0.7 or the EF 600mm f/4L IS III USM lens with Firmware Version 1.0.7 are attached to certain EOS DSLR cameras¹ and the camera’s shooting mode is set to M or Av mode.
EOS DSLR Cameras ¹:
EOS-1D X Mark II, EOS-1D X, EOS-1D Mark IV, EOS-1D Mark III, EOS-1Ds Mark III, EOS 5D Mark IV（Firmware Version 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 Rebel T6s
EOS Rebel T7
EOS Rebel T6
EOS Rebel T5
EOS Rebel T3
EOS Rebel T6i
EOS Rebel SL1
EOS Rebel T4i
EOS Rebel T3i
EOS Digital Rebel T2i
EOS Digital Rebel T1i
EOS M, EOS M2
Note: This doesn’t occur when shooting still images.
that can be used to run the lens’ firmware update are listed below: (As of
Note: If using a EOS R or EOS M series camera to update the lens’ firmware, a mount adaptor is required.
Note: If you are not able to perform the firmware update, please contact Canon Customer Service Center and follow the Workaround procedures listed below.
During movie shooting, follow the workaround procedures below to prevent the issue from occurring.
|Lens Only||No Extender|| For movie shooting, set the camera according to options (1) or (2) listed below.
|Lens with Extender||Extender EF1.4x||For movie shooting, set the camera’s shooting mode to P or Tv mode.|
|Extender EF2x|| For movie shooting, set the camera according to options (1) or (2) listed below.
This information is for residents of the United States and its five territories only. If you do not reside in the USA or its five territories, please contact the Canon Customer Support Center in your region.
Customer Support Operations
Canon U.S.A., Inc
|Contact Information for Inquiries
|Canon Customer Support Center
|Support options and hours of operation: www.usa.canon.com/support|