Both Samsung SL620 and Olympus TG-2 iHS have 1/2.3-inch sized 12.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the SL620 and TG-2 iHS sensor size comparison.
Sensor Size and Resolution Comparison image of Samsung SL620 and Olympus TG-2 iHS Cameras
Samsung SL620 and Olympus TG-2 iHS 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.
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
Samsung SL620
or the
Olympus TG-2 iHS ,
including hyperfocal distance.
