Canon just posted a firmware update for their EOS-1D Mark III, EOS-1D Mark IV, and EOS-1Ds Mark III DSLR cameras.
The new firmware addresses the following two issues:
- Resolves the following phenomenon: when the camera is not attached to a lens, power consumption may be higher than usual, causing premature battery drain.
- Resolves a phenomenon in which "Err 70" ("Err 02" on the 1D Mark IV) may be displayed when the shutter is released without a lens attached.
You can download the new firmwares from the Canon USA website: