R: Aperture-Priority Auto; A: Aperture-Priority Auto - Nikon D300s User Manual

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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 A.
Press the MODE button
and rotate the main
command dial until A is
displayed in the
viewfinder and control
panel.
MODE button
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Sub-command dial
Rotate the su b-
command dial while
the exposure meters
are on 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
105),
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.
2
Choose an aperture.
Large aperture (f/2.B)
109