Menu Function Settings; Exposure Simulation ; Grid Display  - Canon EOS 7D Instruction Manual

z Menu Function Settings
Live View shoot.
Set Live View shooting to [Enable] or [Disable]. Even if [Disable] is set,
you can still shoot movies (p.153).
AF mode
You can select [Live mode] (p.142), [u Live mode] (p.143), or [Quick
mode] (p.147).
Grid display
With [Grid 1l] or [Grid 2m], you can display grid lines.
Expo. simulationN
Exposure simulation displays and simulates how the brightness of the
actual image will look. The [Enable] and [Disable] settings are
explained below:
Enable

The image brightness displayed will be close to the actual brightness
of the resulting image. If you set exposure compensation, the image
brightness will change accordingly.
Disable

The image is displayed at the standard brightness to make the Live
View image easy to see.
140
Function settings particular to Live View
shooting are explained here. The menu
options under the [z] tab are explained
below.
The functions settable in this menu
screen only apply during Live View
shooting. These functions do not take
effect during viewfinder shooting.