Samsung NX100 ユーザーズマニュアル

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My Camera > 
Shooting modes
40
P Program mode
The camera automatically adjusts shutter speed and aperture value so 
that an optimal exposure value can be achieved.
This mode is useful when you want to take shots of constant exposure 
while being able to adjust other settings.
Program Shift
Program Shift function lets you adjust the shutter speed and aperture 
value while the camera maintains the same exposure. When you rotate 
the jog dial to the left, the shutter speed decreases and the aperture 
value increases. When you rotate the jog dial to the right, the shutter 
speed increases and the aperture value decreases.