Olympus SP-820UZ has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor . On the other hand, Olympus SP-620 UZ has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features TruePic III+ processor.
Below you can see the SP-820UZ and SP-620 UZ sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus SP-820UZ and Olympus SP-620 UZ Cameras
Olympus SP-820UZ and Olympus SP-620 UZ 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 Olympus SP-820UZ has 15% larger pixel area compared to Olympus SP-620 UZ, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
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 SP-820UZ
or the
Olympus SP-620 UZ ,
including hyperfocal distance.
