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. On the other hand, Canon SX50 HS has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Digic 5 processor.
Below you can see the SP-620 UZ and SX50 HS sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus SP-620 UZ and Canon SX50 HS Cameras
Olympus SP-620 UZ and Canon SX50 HS 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 SX50 HS has 32% larger pixel area (2.34µm 2 vs 1.76µm 2 ) compared to Olympus SP-620 UZ, 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-620 UZ
or the
Canon SX50 HS ,
including hyperfocal distance.