Canon has released firmware v1.0.3 for the Canon EOS-1D Mark II.
The free update adds support for the colour information communication capability of the Speedlite 580EX, reduces noise in exposures longer than 1 second (with long exposure noise reduction enabled) and fixes a problem in which the shutter would not open when the sensor cleaning function was activated immediately after shooting Bulb exposures.
At the time of the announcement of the 580EX earlier this year, information from Canon suggested that the new pro Speedlite would be designed to zoom to match the angle of coverage of the sensor in each of Canon's 2004-vintage digital SLR cameras. New information from Canon USA's Chuck Westfall, however, indicates that may not be the case. Though the 580EX will zoom to properly match the lens coverage of the EOS 20D and its 1.6x field of view magnification factor, this same functionality is not likely to be extended to the 1.3x EOS-1D Mark II, and is definitely not present in firmware v1.0.3.
Westfall also notes that while Canon USA has few details on the improvements in the long exposure noise reduction function of the EOS-1D Mark II, he suspects the changes are aimed at reducing noise processing artifacts in astronomical photographs in particular.
An EOS-1D Mark II serial number is required to download firmware v1.0.3.