Canon 550D has a
18.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features Digic 4 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 550D and 70D sensor size comparison.
Canon 550D and Canon 70D 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 550D and Canon 70D sensors have been tested by DxO and the results show that 70D has a better overall score of 68, 2 points higher compared to 550D's score of 66.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 550D |
66 |
22.0 bits |
11.6 Evs |
807 ISO |
Canon 70D |
68 |
22.5 bits |
11.6 Evs |
926 ISO |