Olympus E-M1 has a
16.0MP Four Thirds (17.3 x 13 mm ) sized CMOS sensor and features TruePIC VII processor. On the other hand, Canon 70D has a
20.0MP APS-C (22.5 x 15 mm ) sized CMOS sensor and features Digic 5+ processor.
Below you can see the E-M1 and 70D sensor size comparison.
As seen above, Canon 70D has a 1.5x Larger sensor area than Olympus E-M1. 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
Both Olympus E-M1 and Canon 70D 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, E-M1 has scored 73, 5 points higher than 70D.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Olympus E-M1 |
73 |
23.0 bits |
12.7 Evs |
757 ISO |
Canon 70D |
68 |
22.5 bits |
11.6 Evs |
926 ISO |