PMA 2009: Canon has announced a new AF fix for the EOS-1D Mark III and EOS-1Ds Mark III. This is in addition to the sub mirror fix issued earlier by Canon, and requires returning the camera to Canon for service. New firmware for the 1D Mark III and 1Ds Mark III has also been released to fix issues with live view, USB communication, and to update camera error codes. This brings the versions up to 1.2.5 and 1.1.4 respectively, and is available for download now.

From Canon's statement:

Canon is aware that some owners of the EOS-1D Mark III and EOS-1Ds Mark III digital SLR cameras have been experiencing problems with their cameras concerning the accuracy of the Auto focusing and display of the error code Err99. Canon has investigated the cause of these issues and is pleased to announce a service solutions to these issues.

To obtain free check up and repair (if required) for these issues, please visit the Canon service web site for more information and register your product and details on the 1D(s) Mark III repair registration form.

Click here for further information and to register for the AF fix

Click here for further information and to register for the Err99 fix

Users who have registered using the Canon 1D(s) Mark III repair registration form will be contacted by their local Canon service center to schedule a check up, to ensure the minimum inconvenience to customers as possible. 

Finally Canon Inc have today published a web page explaining to users how to get the best out of their EOS-1D Mark III AF system.

Click here for further information on how to optimize AF performance with 1 series Mark III cameras.

The firmware for both 1D Mark III and 1Ds Mark III resolve the same issues:

1. Correction of a display issue with Live view which caused the camera to display a black screen when using the Live View zoom/enlarge function.
2. Correction of a USB communication issue which caused the camera to remain in USB communication mode even when the USB cable has been disconnected and the message "busy" to be continuously displayed on the LCD.
3. Changes to the error codes. More detailed error codes are now displayed, enabling better clarification as to the causes of errors.
New error codes

Click here for further information and to download 1D Mark III firmware

Click here for further information and to download 1Ds Mark III firmware