Samsung NX20 has a
20.0MP APS-C (23.5 x 15.7 mm ) sized CMOS sensor . On the other hand, Sony A7 III has a
24.0MP Full frame (35.8 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz X processor.
Below you can see the NX20 and A7 III sensor size comparison.
As seen above, Sony A7 III has a 2.3x Larger sensor area than Samsung NX20. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in 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 Sony A7 III sensors have been tested by DxO and the results show that A7 III has a better overall score of 96, 21 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 |
Sony A7 III |
96 |
25.0 bits |
14.7 Evs |
3730 ISO |