Canon has today posted firmware version 1.0.3 for the EOS-1D Mark II digital SLR. The firmware adds new functions for communicating with Speedlite 580EX, reduces noise when shooting bulb exposures and fixes sensor cleaning operation.
EOS-1D Mark II Firmware Update Version 1.0.3
This firmware update fixes/improves the following:
Added new functions for communicating with the Speedlite 580EX
Reduced noise when shooting bulb exposures
Fixed sensor-cleaning operations
This firmware supports cameras with firmware Version 1.0.1 or 1.0.2. If the camera already has the Version 1.0.3 firmware, this update is unnecessary.