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, Sony A390 has a
14.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor and features Bionz processor.
Below you can see the A330 and A390 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A330 and Sony A390 Cameras
Sony A330 and Sony A390 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Sony A330 has 39% larger pixel area compared to Sony A390, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
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 Sony A390 sensors have been tested by DxO and the results show that A390 has a better overall score of 66, 2 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
Sony A390
66
22.5 bits
11.5 Evs
607 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
Sony A390 ,
including hyperfocal distance.
