Canon has released firmware version 1.1.0 for their EOS 5D digital SLR camera. The new version improves the direct printing function with certain printers, corrects communications errors with the EOS Capture software, and fixes a bug that changed flash settings when the camera is used with the Speedlite Transmitter ST-E2 and Speedlite 580EX.
Your camera may already have version 1.1.0 installed, but if not, you can download the update from Canon.
