Nikon Nikon 1 AW1 Reference Manual (en)

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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.
Choosing an Aperture
Press 
W for larger apertures (lower f-
numbers), 
X for smaller apertures (higher
f-numbers).
Large aperture (f/5.6)
Small aperture (f/16)
W button
X button