Service Notice: EOS-1D Mark III/EOS-1Ds Mark III: AF Accuracy Adjustment


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 (autofocusing) 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.


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


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.

November 16, 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 are in the process of creating 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.



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

Thank you for your patronage and support of Canon products.

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.

Contact Information for Inquiries
Canon U.S.A., Inc.
Customer Support Center
Phone:       1-800-OK-CANON (toll free)

Support options and hours of operation:

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