Samsung NX1000 User Manual page 45

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 capture shots of constant
exposure while being able to adjust other settings.
Program Shift function lets you adjust the shutter speed and aperture
value while the camera maintains the same exposure. When you rotate
the navigation button counter-clockwise, the shutter speed decreases
and the aperture value increases. When you rotate the navigation
button clockwise, the shutter speed increases and the aperture value
decreases.
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