Product Notice

To Users of the EOS -1D X Digital SLR Camera

Posted on: 4 December 2012

To Users of the EOS -1D X Digital SLR Camera:

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.

Affected Product
Canon EOS-1D X Digital SLR Cameras
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.

You can download the firmware from the following link.



Contact Information for Inquiries

For questions about this matter, please contact our Customer Service Hotline.

Hotline Enquiry Hours
Customer Care Center Address and Opening Hours