Canon EOS 7D - Manual (Page 51)

51
Basic Shooting
This chapter explains how to use the fully-automatic
modes (1/C) on the Mode Dial for best results.
With the fully-automatic modes (1/C), all you do is point
and shoot and the camera sets everything automatically
(p.254). Also, to prevent botched pictures due to mistaken
operations, major shooting settings cannot be changed in the
fully-automatic modes.
Fully-
automatic
modes
About the Auto Lighting Optimizer
In fully-automatic modes (1/C), the Auto Lighting Optimizer will
adjust the image automatically to obtain the optimum brightness
and contrast. The Auto Lighting Optimizer is also enabled by
default in all shooting modes (p.77).