Canon EOS 1DS MARK II 9443A009 Instruction Manual (en)

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In this mode, you set the desired aperture and the camera sets the 
shutter speed automatically to suit the subject brightness. This is called 
aperture-priority AE. 
A larger aperture (lower f/number) will result in a blurred background 
ideal for portraits. The lower the f/number, the more blurred the 
background will become. If a smaller aperture (larger f/number) is used, 
the foreground and background will be in focus. The higher the f/
number, the clearer the focus will be for both near and far subjects. 
*
f
 stands for Aperture value. 
1
Select <
f
> on the LCD panel. 
¡
Hold down the <
W
> button and 
turn the <
6
> dial to select <
f
>. 
Then let go of the button. 
2
Set the desired aperture value. 
¡
Look at the top LCD panel and turn 
the <
6
> dial. 
3
Focus the subject. 
¡
Press the shutter button halfway. 
s
The shutter speed is set automatically. 
fAperture-Priority AE
With a large aperture
With a small aperture