Canon Product Advisory: Canon EF 400mm IS III USM and Canon EF 600mm IS III USM

Canon has issued out a product advisory for the newly released Canon EF 400mm 2.8L IS III USM and the Canon EF 600mm 2.8L IS III USM.  It seems that some exposure flicker may occur with these two lenses with the camera set to either Av mode or M mode during video shooting only. This problem does not occur during regular stills shooting.

This is a pretty limited bug but it seems to affect basically any camera with either of these lenses mounted.

There are currently workarounds to this problem.  For use with either the 2x extender or the lens only mounted to the camera, set the camera to either P or Tv mode and also set the exposure level increment to ½ or 1 stop EV.

For use with the 1.4x extender, you merely have to set the camera to P or Tv mode.

Canon also suggests that you register the lens so you get an email when the firmware is released to properly fix this problem.

The actual product advisory is shown below;

Thank you for using Canon products.

We take great pride in the quality and performance of our products. We offer our sincerest apologies to any customers who may be inconvenienced.

Products

EF 400mm f/2.8L IS III USM and EF 600mm f/4L IS III USM running firmware 1.0.7.

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

Details

We have determined that during movie shooting when attached to certain EOS DSLR cameras¹, 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 Mark IV, EOS-1D Mark Ⅲ, EOS-1Ds MarkⅢ
EOS 5D Mark IV（Firmware Version 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 Rebel T6s
EOS Rebel T7
EOS Rebel T6
EOS Rebel T5
EOS Rebel T3
EOS Rebel T6i
EOS RebelT5i
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.

Support

Canon is currently developing a firmware solution, which is expected to be released in the near future. 

Workaround

In the interim, if the issue occurs, follow these instructions:

	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.  Note: *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 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. In the camera’s Custom Functions, set the exposure level increments to 1/2-stop or 1-stop.  Note:*The possible values that can be set vary depending on the camera model. Set the camera’s shooting mode to P or Tv mode.

 

If you have not already done so, please register the EF 400mm f/2.8L IS III USM and EF 600mm f/4L IS III. By registering, we will be able to notify you via email about future announcements.

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.

Thank you,
Customer Support Operations
Canon U.S.A., Inc

Contact Information for Inquiries
Canon Customer Support Center
Phone:	1-800-OK-CANON
	1-800-652-2666
TDD:	1-866-251-3752
Email:	[email protected]
Support options and hours of operation: www.usa.canon.com/support