AF Accuracy Adjustment Problem

To Owners of the EOS-1D Mark III and EOS-1Ds Mark III Digital SLR Cameras

Thank you for using Canon products.
We have learned that some EOS-1D Mark III and EOS-1Ds Mark III digital SLR cameras have a problem in the accuracy of the AF (auto focusing) feature. Accordingly, we would like to provide information about the details of this issue and how it can be resolved.

We offer our sincerest apologies to customers using these products who have been inconvenienced by this issue. Canon always strives to provide the highest quality products to our customers, and we spare no effort in our quality management to make sure our customers can use our products with confidence. We hope our efforts will earn your understanding.

Phenomenon

If an AF point other than the center AF point is used, focus may become soft.

Affected Products

EOS-1D Mark III and EOS-1Ds Mark III digital SLR cameras

Support

Free AF accuracy checks and adjustments will be provided to affected products. Please contact our service center if you own an affected product and wish to arrange for service.

Other Information Regarding AF (Auto-focusing) with EOS-1D Mark III and EOS-1Ds Mark III

The following Web announcements were previously released to inform users about improvements in the AF accuracy of the EOS-1D Mark III and EOS-1Ds Mark III.

● December 4, 2007
EOS-1D Mark III: Start of Repairs for AF Mirror Adjustment Problem  

● April 30, 2008
New firmware of the EOS-1D Mark III and EOS-1Ds Mark III improves the stability of AF accuracy in AI servo AF when shooting extremely low-contrast subjects.

The above information, together with the provision of free AF accuracy checks and adjustments, allow users to utilize the AF function of the EOS-1D Mark III and EOS-1Ds Mark III with greater assurance. 

Based on the comments and suggestions of professional photographers, we have also created Supplementary AI Servo AF Information (AI Servo Auto Focus Manual) for users to fully utilize the AF capacity of the cameras. Please refer to this information when you shoot with the EOS-1D Mark III and EOS-1Ds Mark III cameras.

For details, please go to the following website

http://web.canon.jp/imaging/eosd/eos1dm3af/index.html