Canon 1D X units with the sixth digit from the left in the body number is 4 or 5 may be affected. Canon recommends overwriting the firmware with the latest copy available. More details in the full product advisory below.
It has been confirmed that auto-focusing may not function at f/8 aperture on some Canon EOS-1D X Digital SLR Cameras with firmware Ver. 1.1.1.
We offer our most sincere apologies to customers using this product who have been inconvenienced by this issue.
The support measures for this phenomenon are described below.
Firmware Ver. 1.1.1 enabled the center AF point to autofocus when the camera is used with lens/extender combinations whose combined maximum aperture is f/8.
On some of the cameras with firmware Ver. 1.1.1, auto-focusing does not function at f/8 aperture.
*This phenomenon does not occur with a camera which firmware has been updated by a user, or by Canon service center.
Canon EOS-1DX Digital SLR Camera
Cameras with the sixth digit from the left in the body number (serial number) is 4 or 5 are affected.
Example: Body No. xxxxx4xxxxxx or xxxxx5xxxxxx ([x] represents any optional number.)
*Even if the sixth digit from the left in the body number (serial number) is 4 or 5, the following cameras are not affected units.
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Overwriting the firmware activates auto-focusing at f/8 aperture. To accomplish this, please download the firmware Ver. 1.1.1 available for download from Canon Web site, and overwrite the firmware of the camera.
This information is for residents of the United States and Puerto Rico only. If you do not reside in the USA or Puerto Rico, please contact the Canon Customer Support Center in your region.
Please register the EOS-1DX. By registering, we will be able to notify you via email when service updates are available.
Customer Support Operations
Canon U.S.A., Inc
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