Firmware Notice: EF 400mm F4 DO IS II USM: Firmware Version 1.0.9
Firmware Version 1.0.9 incorporates the following fix.
Fixes a phenomenon where, in rare cases, the IS mechanism may cause the image to jump.
Firmware Version 1.0.9 is for lenses with Firmware Version 1.0.8 or earlier. If the lens’ firmware is already Version 1.0.9, it is not necessary to update the firmware.
The lens’ firmware version can be checked from the camera’s menu. Refer to the camera instruction manual for how to check the version.
Download Firmware Version 1.0.9 for the EF 400mm F4 DO IS II USM.
If you have not already done so, please register the EF 400mm F4 DO IS II USM STM. 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.
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
Support options and hours of operation: www.usa.canon.com/support