Canon EOS 70D, Basic Instruction Manual

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In this mode, you set the desired aperture and the camera sets the
shutter speed automatically to obtain the standard exposure suiting the
subject brightness. This is called aperture-priority AE. 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).
1
Set the Mode Dial to <
f
>.
2 Set the desired aperture.
While looking at the LCD panel, turn
the <
6
> dial.
3
Focus the subject.
Press the shutter button halfway.
X
The shutter speed is set
automatically.
4 Check the viewfinder display and shoot.
As long as he shutter speed is not blinking,
a standard exposure will be obtained.
f
: Aperture-Priority AE
Sharp foreground and background
(With a high aperture f/number: f/32)
Blurred background
(With a low aperture f/number: f/5.6)