Canon EOS 90D DSLR Camera with 18-135mm Lens - Manual (Page 114)

114
Setting the Aperture Value Before Shooting
( Aperture-Priority AE)
In this mode, you set the desired aperture and the camera sets the shutter
speed automatically to obtain the standard exposure matching the subject
brightness. A higher f/number (smaller aperture hole) will make more of the
foreground and background fall within acceptable focus. On the other hand,
a lower f/number (larger aperture hole) will make less of the foreground and
background fall within acceptable focus.
* <
f
> stands for Aperture value (aperture opening).
Blurred background
(With a low aperture
f/number: f/5.6)
Sharp foreground and background
(With a high aperture
f/number: f/32)
1 Set the Mode dial to < f >.
2 Set the desired aperture.
 Set with the <
6
> dial.
3 Focus on the subject.

Press the shutter button halfway.
4 Check the display and shoot.

As long as the shutter speed is not
blinking, the standard exposure will be
obtained.