Pentax K-5 IIs has a
16.0MP APS-C (23.7 x 15.7 mm ) sized CMOS sensor and features Prime II processor. On the other hand, Samsung NX20 has a
20.0MP APS-C (23.5 x 15.7 mm ) sized CMOS sensor .
Another difference between these two cameras is that Pentax K-5 IIs's sensor lacks anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the K-5 IIs and NX20 sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K-5 IIs and Samsung NX20 Cameras
Pentax K-5 IIs and Samsung NX20 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 Pentax K-5 IIs and Samsung NX20 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, K-5 IIs has scored 82, 7 points higher than NX20.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Pentax K-5 IIs
82
23.9 bits
14.1 Evs
1208 ISO
Samsung NX20
75
23.4 bits
12.9 Evs
785 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
Pentax K-5 IIs
or the
Samsung NX20 ,
including hyperfocal distance.
