Sony A550 has a
14.0MP APS-C (23.4 x 15.6 mm ) sized CMOS sensor and features Bionz processor. On the other hand, Sony A580 has a
16.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Bionz processor.
Below you can see the A550 and A580 sensor size comparison.
Sony A550 and Sony A580 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. Sony A550 and Sony A580 sensors have been tested by DxO and the results show that A580 has a better overall score of 80, 14 points higher compared to A550's score of 66.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A550 |
66 |
21.9 bits |
11.8 Evs |
807 ISO |
Sony A580 |
80 |
23.8 bits |
13.3 Evs |
1121 ISO |