Both Samsung NX300 and Sony A58 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 NX300 and A58 sensor size comparison.
Sensor Size and Resolution Comparison image of Samsung NX300 and Sony A58 Cameras
Samsung NX300 and Sony A58 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
Both Samsung NX300 and Sony A58 sensors have been tested by DxoMark. DxoMark 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. Of the two cameras that we are comparing, NX300 has scored 76, 2 points higher than A58.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Samsung NX300
76
23.6 bits
12.7 Evs
942 ISO
Sony A58
74
23.3 bits
12.5 Evs
753 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
Samsung NX300
or the
Sony A58 ,
including hyperfocal distance.
