Nikon D300 User Manual (en)

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107
Z
g: Aperture-Priority Auto
In aperture-priority auto, you choose the aperture while the camera 
automatically selects the shutter speed that will produce the 
optimal exposure. To take photographs in aperture-priority auto:
1
Select exposure 
mode 
g.
Press the 
I button 
and rotate the main 
command dial until 
g is 
displayed in the 
viewfinder and control 
panel.
2
Choose an aperture.
Rotate the sub-
command dial to 
choose the desired 
aperture from values 
between the minimum 
and maximum for the 
lens. Small apertures (high f-numbers) increase depth of field 
(see page 103), bringing both foreground and background 
into focus. Large apertures (low f-numbers) soften 
background details in portraits or other compositions that 
emphasize the main subject.
I button
Main command dial
Sub-command dial
Large aperture (f/2.8)
Small aperture (f/36)