Sony A77 has a
24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Bionz processor. On the other hand, Sony A850 has a
25.0MP Full frame (35.9 x 24 mm ) sized CMOS sensor and features Bionz processor.
Below you can see the A77 and A850 sensor size comparison.
As seen above, Sony A850 has a 2.4x Larger sensor area than Sony A77. 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. Sony A77 and Sony A850 sensors have been tested by DxO and the results show that A850 has a better overall score of 79, 1 points higher compared to A77's score of 78.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A77 |
78 |
24.0 bits |
13.2 Evs |
801 ISO |
Sony A850 |
79 |
23.8 bits |
12.2 Evs |
1415 ISO |