Both Sony A560 and Sony A33 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 A560 and A33 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A560 and Sony A33 Cameras
Sony A560 and Sony A33 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.
DxOMark Sensor Scores
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A560
70
22.5 bits
12.3 Evs
817 ISO
Sony A33
70
22.8 bits
12.6 Evs
591 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 A560
or the
Sony A33 ,
including hyperfocal distance.