Nikon 1 J2 ユーザーズマニュアル

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The options in the exposure mode menu offer varying degrees
of control over shutter speed and aperture.
Exposure Mode
Scene auto selector
An automatic, “point-and-shoot” mode in which
the camera not only chooses shutter speed and
aperture but adjusts other settings to suit the
subject (automatic scene selection; 
P Programmed auto
The camera sets shutter speed and aperture for
optimal exposure (
S Shutter-priority auto
You choose the shutter speed; the camera
selects an aperture for best results (
A Aperture-priority auto
You choose the aperture; the camera selects a
shutter speed for best results (
M Manual
You control both shutter speed and aperture
(
0 115).  Set shutter speed to “Bulb” or “Time”
for long time-exposures.
A
ISO Sensitivity (P, S, A, and M Modes)
When an “auto” option is selected for ISO sensitivity, the camera will
automatically adjust sensitivity within the selected range if optimal
exposure can not be achieved at the selected shutter speed or aper-
ture.