Both Sony A58 and Samsung NX2000 have APS-C sized 20.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the A58 and NX2000 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A58 and Samsung NX2000 Cameras
Sony A58 and Samsung NX2000 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Sony A58 and Samsung NX2000 sensors have been tested by DxO and the results show that NX2000 has a better overall score of 75, 1 points higher compared to A58's score of 74.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A58
74
23.3 bits
12.5 Evs
753 ISO
Samsung NX2000
75
23.4 bits
12.3 Evs
908 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Sony A58
or the
Samsung NX2000 ,
including hyperfocal distance.
