Canon EOS 5D Mark III Instruction Manual (en)

When you press the <
B> button 
while the camera is ready to shoot, you 
can display [Displays camera settings], 
[Electronic level] (p.60), and [Displays 
shooting functions
] (p.343).
Under the [53] tab, [
z button display 
options] enables you to select the options 
displayed when the <
B> button is 
Select the desired display option and press 
0> to append a checkmark <X>.
After making the selection, select 
[OK], then press <
* This icon is displayed when the transfer of some images failed.
B Button Functions
Camera Settings
Note that you cannot remove the <X> for all three display options.
The [Displays camera settings] sample screen is displayed in English 
for all languages.
Even if you uncheck the [Electronic level] so it does not appear, it will still appear 
for Live View shooting and movie shooting when you press the <
B> button.
(p.142, 143)
Shooting mode registered 
under the Mode Dial’s w, 
x, and y
(p.32, 123)
Transfer of some 
images failed*
Color temperature