Nikon Digital Camera, Reference Manual

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A 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. Large apertures (low f-numbers) reduce
depth of field, blurring objects behind and in front of the main
subject. Small apertures (high f-numbers) increase depth of
field, bringing out details in the background and foreground.
Short field depths are generally used in portraits to blur back-
ground details, long field depths in landscape photographs to
bring the foreground and background into focus.
1 Choose an aperture.
Press W up for smaller aper tures
(higher f-numbers), down for larger
apertures (lower f-numbers). The min-
imum and maximum values depend
on the lens currently in use.
2 Frame a photograph, focus, and shoot.
Large aperture (f/5.6) Small aperture (f/16)
W
control