To Users of the EF 400mm f/2.8L IS III USM and EF 600mm f/4L IS III USM Interchangeable Lenses for Digital SLR Cameras

18th March 2019

Thank you for using Canon products.

Please be informed of the information outlined below regarding an upcoming firmware release for the EF 400mm f/2.8L IS III USM and EF 600mm 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.


Products

EF 400mm f/2.8L IS III USM and EF 600mm f/4L IS III USM

Note: The firmware which we are planning to release is for lenses equipped with firmware version 1.0.7.

The lens firmware version can be checked in the camera’s menu.


Details

The firmware planned for upcoming release will incorporate the following correction.

Correction:
Corrects the phenomenon whereby, during movie shooting, when attached to certain EOS DSLR cameras*1 with the camera’s shooting mode set to M or Av mode, some exposure flicker may happen.

EOS DSLR Cameras*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 5DsR,
EOS 7D Mark II, EOS 7D, EOS 6D, EOS 80D, EOS 70D, EOS 60D, EOS 60Da,
EOS 8000D/EOS REBEL T6S/EOS 760D,
EOS Kiss X90/EOS REBEL T7/EOS 2000D/EOS 1500D,
EOS Kiss X80/EOS REBEL T6/EOS 1300D,
EOS Kiss X70/EOS REBEL T5/EOS 1200D/EOS Hi,
EOS Kiss X50/EOS REBEL T3/EOS 1100D,
EOS Kiss X8i/EOS REBEL T6i/EOS 750D,
EOS Kiss X7i/EOS REBEL T5i/EOS 700D,
EOS Kiss X7/EOS REBEL SL1/EOS 100D,
EOS Kiss X6i/EOS REBEL T4i/EOS 650D,
EOS Kiss X5/EOS REBEL T3i/EOS 600D,
EOS Kiss X4/EOS DIGITAL REBEL T2i/EOS 550D,
EOS M, and EOS M2

Note: This phenomenon doesn’t occur when shooting still images.


Workaround

In the interim, during movie shooting, please perform the workaround procedures below to prevent the occurrence of this phenomenon.

Extender Type Workaround
Lens only No extender For movie shooting, set the camera according to options (1) or (2) listed below.
(1) In the camera’s Custom Functions, set the exposure level increments to 1/2-stop or 1-stop. (*The possible values that can be set vary depending on the camera model.)
(2) Set the camera’s shooting mode to P or Tv mode.
Lens with Extender Extender EF1.4× For movie shooting, set the camera’s shooting mode to P or Tv mode.
Extender EF2× For movie shooting, set the camera according to options (1) or (2) listed below.
(1) In the camera’s Custom Functions, set the exposure level increments to 1/2-stop or 1-stop. (*The possible values that can be set vary depending on the camera model.)
(2) Set the camera’s shooting mode to P or Tv mode.
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