EOS-1D C Cinema EOS Camera Firmware Version 1.4.0

Fixes a phenomenon which occurs when the “Shutter button half-press” menu item, configured in “C.Fn5: Operation”>”Custom Controls Menu”, is set to metering start only; depending on when the shutter button is half-pressed, it may initiate AutoFocus.

Firmware Version 1.4.0 includes all improvements and fixes provided in previous firmware versions. 
Notes: 

As a result of this fix, cameras with Firmware Version 1.3.9 (or later) will not be able to read the “camera settings file” created with cameras running Firmware Version 1.3.5 (or earlier). If you require the “camera settings file”, please create it after updating to firmware version 1.3.9 (or later).