Firmware Notice: EF 400mm f/2.8L IS III USM and EF 600mm f/4L IS III USM, Firmware version 1.0.8

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Phenomenon
Firmware version 1.0.8 incorporates the following 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 MarkⅢ, 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 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, EOS M2

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

Affected Products

EF400mm f/2.8L IS III USM and EF600mm f/4L IS III USM

Support
Firmware version 1.0.8 being released at this time is for lenses equipped with firmware version 1.0.7. The lens firmware version can be checked in the camera’s menu.

You can download the latest firmware from the link below.

In order to update the lens’ firmware you must use a certain camera.

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 Kiss X9i/EOS Rebel T7i/EOS 800D, EOS Kiss X9/EOS REBEL SL2/EOS 200D
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 M/M50, EOS M6, EOS M5, EOS M3, EOS M2, EOS M, EOS M100, EOS M10, EOS R, EOS RP

Note: A mount adaptor is required when using an EOS R or EOS M series camera to update the lens’ firmware.

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. 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.) Set the camera’s shooting mode to P or Tv mode.
Lens with Extender	Extender EF 1.4x	For movie shooting, set the camera’s shooting mode to P or Tv mode.
Lens with Extender	Extender EF 2x	For movie shooting, set the camera according to options (1) or (2) listed below. 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.) Set the camera’s shooting mode to P or Tv mode.

Contact Information
Should you have any questions about the announcement, please contact the Authorized Service Facility in your area or you may contact the Call Center within your region.

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