Canon EOS 5D Mark III Instruction Manual (en)

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Nomenclature
Mode Dial
Turn the Mode Dial while holding down the Mode Dial center (Mode Dial 
lock release button).
A :Scene Intelligent Auto (p.64)
F : Bulb (p.174)
a
: Manual exposure (p.168)
f
: Aperture-priority AE (p.166)
s
: Shutter-priority AE (p.164)
d
: Program AE (p.162)
Custom shooting modes
You can register the shooting mode (d/s/f/a/F), AF mode, 
menu settings, etc., to w, x, y Mode Dial settings and shoot 
(p.338).