Both Sony A390 and Sony A350 have APS-C sized 14.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the A390 and A350 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A390 and Sony A350 Cameras
Sony A390 and Sony A350 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
Both Sony A390 and Sony A350 sensors have been tested by DxoMark. DxoMark 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. Of the two cameras that we are comparing, A390 has scored 66, 1 points higher than A350.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A390
66
22.5 bits
11.5 Evs
607 ISO
Sony A350
65
22.6 bits
11.5 Evs
595 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 A390
or the
Sony A350 ,
including hyperfocal distance.
