Nikon D300 - Manual (Page 133)

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)