Olympus SP-820UZ has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor . On the other hand, Canon N Facebook ready has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor and features Digic 5 processor.
Below you can see the SP-820UZ and N Facebook ready sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus SP-820UZ and Canon N Facebook ready Cameras
Olympus SP-820UZ and Canon N Facebook ready 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 Canon N Facebook ready has 52% larger pixel area (3.12µm 2 vs 2.04µm 2 ) compared to Olympus SP-820UZ, it has larger pixel area to collect light hence potential to 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
Canon N Facebook ready ,
including hyperfocal distance.