Both Nikon D80 and Sony A330 have APS-C sized 10.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the D80 and A330 sensor size comparison.
Nikon D80 and Sony A330 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. Nikon D80 and Sony A330 sensors have been tested by DxO and the results show that A330 has a better overall score of 64, 3 points higher compared to D80's score of 61.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Nikon D80 |
61 |
22.1 bits |
11.2 Evs |
524 ISO |
Sony A330 |
64 |
22.4 bits |
11.5 Evs |
535 ISO |