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Firmware Notice: EOS-1Ds Mark III: Firmware Version 1.2.3


Thank you for using Canon products.

Canon has released a firmware update for the EOS-1Ds Mark III.


EOS-1Ds Mark III


Firmware Version 1.2.3 for the Canon EOS-1Ds Mark III camera incorporates the following fixes:

  1. Resolves the following phenomenon: when the camera is not attached to a lens, power consumption may be higher than usual, causing premature battery drain.

  2. Resolves a phenomenon in which “Err 70” may be displayed when the shutter is released without a lens attached.

Firmware Version 1.2.3 is for EOS-1Ds Mark III cameras with firmware Version 1.2.2 or earlier. If your camera’s firmware is already Version 1.2.2, it is not necessary to update the firmware.
Before updating your camera’s firmware, please review the instructions thoroughly.



Download Firmware Version 1.2.3

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-1Ds Mark III. By registering, we will be able to notify you via email when future firmware updates are available.

Thank you,
Customer Support Operations
Canon U.S.A., Inc
Contact Information for Inquiries
Canon Customer Support Center
Phone:   1-800-OK-CANON
TDD:     1-866-251-3752
Email: carecenter@cits.canon.com
Support options and hours of operation: www.usa.canon.com/support

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