Olympus VR-320 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features TruePic III processor. On the other hand, Kodak Z990 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized BSI-CMOS sensor .
Below you can see the VR-320 and Z990 sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus VR-320 and Kodak Z990 Cameras
Olympus VR-320 and Kodak Z990 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
Olympus VR-320
or the
Kodak Z990 ,
including hyperfocal distance.