Canon has released firmware updates for both the 1DMkIII and the 1DsMkIII.

For the Canon 1DMkIII, firmware version 1.2.3 is available, giving you:

  • Improved stability of AF accuracy in AI servo AF when shooting extremely low-contrast subjects.
  • Direct selection of AF points by the Multi-controller is added to C.Fn III-9.
  • Alternate access to Exposure compensation is added to C.Fn IV-3.
  • With the camera’s External Speedlite control menu, Flash function settings can be used to set the Wireless setting and Zoom.

For the 1Ds, firmware update 1.1.2 gives you the same things, minus the Speedlite settings.

Download, flash that firmware, and enjoy!