Both Olympus E-M10 II and Sony NEX-5T have 16.0 MP resolution sensors but Olympus E-M10 II's sensor is Four Thirds (17.3 x 13 mm ) and Sony NEX-5T's sensor is APS-C (23.4 x 15.6 mm ).
Since Sony NEX-5T's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Olympus E-M10 II.
Below you can see the E-M10 II and NEX-5T sensor size comparison.
As seen above, Sony NEX-5T 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 Sony NEX-5T sensors have been tested by DxO and the results show that NEX-5T has a better overall score of 78, 5 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 |
Sony NEX-5T |
78 |
23.6 bits |
13.0 Evs |
1015 ISO |