Both Samsung NX20 and Samsung NX30 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 NX20 and NX30 sensor size comparison.
Sensor Size and Resolution Comparison image of Samsung NX20 and Samsung NX30 Cameras
Samsung NX20 and Samsung NX30 have the same sensor sizes so they will provide same level of control over the depth of field when used with 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. Samsung NX20 and Samsung NX30 sensors have been tested by DxO and the results show that NX30 has a better overall score of 77, 2 points higher compared to NX20's score of 75.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Samsung NX20
75
23.4 bits
12.9 Evs
785 ISO
Samsung NX30
77
23.5 bits
12.4 Evs
1014 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 NX20
or the
Samsung NX30 ,
including hyperfocal distance.
