Samsung NX20 has a
20.0MP APS-C (23.5 x 15.7 mm ) sized CMOS sensor . On the other hand, Pentax K-5 has a
16.0MP APS-C (23.7 x 15.7 mm ) sized CMOS sensor and features Prime II processor.
Below you can see the NX20 and K-5 sensor size comparison.
Sensor Size and Resolution Comparison image of Samsung NX20 and Pentax K-5 Cameras
Samsung NX20 and Pentax K-5 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. Samsung NX20 and Pentax K-5 sensors have been tested by DxO and the results show that K-5 has a better overall score of 82, 7 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
Pentax K-5
82
23.7 bits
14.1 Evs
1162 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
Pentax K-5 ,
including hyperfocal distance.
