Canon 70D has a
20.0MP APS-C (22.5 x 15 mm ) sized CMOS sensor and features Digic 5+ processor. On the other hand, Sony A77 II has a
24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Bionz X processor.
Below you can see the 70D and A77 II sensor size comparison.
Canon 70D and Sony A77 II 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. Canon 70D and Sony A77 II sensors have been tested by DxO and the results show that A77 II has a better overall score of 82, 14 points higher compared to 70D's score of 68.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 70D |
68 |
22.5 bits |
11.6 Evs |
926 ISO |
Sony A77 II |
82 |
24.4 bits |
13.4 Evs |
1013 ISO |