Справочник Пользователя для Nikon Digital Camera

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P, S, A, and M Modes
P
SA, and M modes offer different degrees of control over shutter 
speed and aperture. See the Reference Manual for more information 
on each mode.
Mode P (Programmed Auto)
In this mode, the camera automatically adjusts shutter speed and 
aperture for optimal exposure in most situations. This mode is 
recommended for snapshots and other situations in which you want 
to leave the camera in charge of shutter speed and aperture.
User can rotate command dial to choose from different combinations 
of shutter speed and aperture that will produce optimal exposure.
A
Shutter Speed and Aperture
The same exposure can be achieved with different combinations of shutter speed and 
aperture. Fast shutter speeds and large apertures freeze moving objects and soften 
background details, while slow shutter speeds and small apertures blur moving objects and 
bring out background details.
Fast shutter speed 
(
1
/
1,600
s)
Slow shutter speed 
(1 s)
Large aperture (f/5.6)
Small aperture (f/22)
(Remember, the higher the f-number, the 
smaller the aperture.)
Command dial
Shutter speed
Aperture