Canon EOS 5D Mark III with L-Series Zoom Lens Owner's Manual

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Basic Shooting
This chapter explains how to use the Mode Dial’s <
A> 
(Scene Intelligent Auto) mode for easy picture taking.
In the <
A> mode, all you do is point and shoot and the 
camera sets everything automatically (p.346). Also, to prevent 
botched pictures due to mistaken operations, major shooting 
settings cannot be changed.
Scene Intelligent Auto
About the Auto Lighting Optimizer
In the <
A> mode, the Auto Lighting Optimizer (p.142) will adjust 
the image automatically to obtain the optimum brightness and 
contrast. It is also enabled by default in the d/s/f/F modes.