Olympus E-M10 II has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features TruePic VII processor. On the other hand, Samsung NX20 has a
20.0MP APS-C (23.5 x 15.7 mm ) sized CMOS sensor .
Below you can see the E-M10 II and NX20 sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus E-M10 II and Samsung NX20 Cameras
As seen above, Samsung NX20 has a 1.6x Larger sensor area than Olympus E-M10 II. 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. Olympus E-M10 II and Samsung NX20 sensors have been tested by DxO and the results show that NX20 has a better overall score of 75, 2 points higher compared to E-M10 II's score of 73.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Olympus E-M10 II
73
23.1 bits
12.5 Evs
842 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
Olympus E-M10 II
or the
Samsung NX20 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(Four Thirds versus APS-C),
so compare them at the same framing rather than the same focal length.
Put the same focal length on the smaller sensor and it will show less depth of
field, not more, because it also crops tighter. The calculator shows the
full frame equivalent focal length for each body so you can match the framing.
