Richard CanonNews / Monday, March 18, 2019 / Categories: News, Canon General News This post may contain affiliate links(s). An affiliate link means I may earn advertising/referral fees if you make a purchase through my link, without any additional cost to you. It helps to keep this site afloat. Thank you in advance for your support. If you like what we do here, maybe buy me a coffee. 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 Richard CanonNewsRichard CanonNews Richard has been using Canon cameras since the 1990s, with his first being the now legendary EOS-3. Since then, Richard has continued to use Canon cameras and now focuses mostly on infrared photography. Richard is the founder and editor of CanonNews since 2017, and has worked as a writer on CanonRumors and other websites in the past. Other posts by Richard CanonNews Contact author Facebook page Print Tags: Canon Product AdvisoryCanon EF 400mm IS III USMCanon EF 600mm IS III USM Please login or register to post comments.