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You can display a grid in the viewfinder to help you check the camera tilt
or compose the shot.
Select [Viewfinder display].
Under the  tab, select
[Viewfinder display], then press
Select [Grid display].
Select [Grid display], then press
Select [Show], then press <0>.
When you exit the menu, the grid will
appear in the viewfinder.
lDisplaying the Grid
You can display a grid on the LCD monitor during Live View shooting and
before you start shooting a movie (p.214, 265).