This firmware update incorporates the following improvements:
Fixes the phenomenon where the images are
When selecting [Standard] in the Picture Style setting, and a maximum
value of +4 in Colour Density, some images taken with the sRGB colour
space setting could become low-saturation and monochrome-like images.
In addition to [Standard] in the Picture Style, [Clear] and [Twilight]
modes that are provided for download from the Canon Web site may also
have this problem.
Fixes the phenomenon where the shutter cannot be
released when using the EOS 5D + EF85mm F1.2L + Speedlite580EX. This malfunction could happen with some lenses or flashes
this model. For EOS 5D units that contain 1 in the fifth digit of the
body number (e.g., XXXX1XXXXX), the correction will not be reflected
even if the firmware is updated to Version 1.0.5.
If you have an affected product that you would like to have fixed,
please contact the nearest Canon Service Centre.
This firmware update applies to cameras with firmware versions up to
1.0.4 installed. If your camera's firmware is already version 1.0.5, it
is not necessary to perform this update.
Further details of the update and a link to download can be found on
Canon's Japanese website