Sony A330 has a
10.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor and features Bionz processor. On the other hand, Nikon D3100 has a
14.0MP APS-C (23.1 x 15.4 mm ) sized CMOS sensor and features Expeed 2 processor.
Below you can see the A330 and D3100 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A330 and Nikon D3100 Cameras
Sony A330 and Nikon D3100 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 A330 and Nikon D3100 sensors have been tested by DxO and the results show that D3100 has a better overall score of 67, 3 points higher compared to A330's score of 64.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A330
64
22.4 bits
11.5 Evs
535 ISO
Nikon D3100
67
22.5 bits
11.3 Evs
919 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Sony A330
or the
Nikon D3100 ,
including hyperfocal distance.
