Samsung NX1 - Depth of Field; What Controls Out-Of-Focus Effects

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Concepts in Photography
Depth of eld
The depth of eld (DOF) is the focused area around the subject.
In general, the DOF can be shallow or deep. In photos with a shallow DOF,
the subject is sharply focused, the background is blurred and the subject
stands out. In contrast, photos with a deep DOF have all the elements of
the photo in sharp focus.
You can create a photo with a shallow DOF by using a telescopic lens or by
selecting a low aperture value. You can create a photo with a deep DOF by
using a wide angle lens or by selecting a high aperture value.
Shallow Depth of Field Deep Depth of Field
What controls out-of-focus eects?
DOF depends on the aperture value
A low aperture value indicates that the aperture has a wide opening. The
wider the aperture, the shallower the DOF becomes. Conversely, a high
aperture value indicates that the aperture has a narrow opening. The
narrower the aperture, the deeper the DOF becomes.
50 mm F5.7 50 mm F22