Canon SX610 HS has a
20.0MP 1/2.3' (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features DIGIC 4+ processor. On the other hand, Olympus SH-3 has a
16.0MP 1/2.3' (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features TruePic VII processor.
Below you can see the SX610 HS and SH-3 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon SX610 HS and Olympus SH-3 Cameras
Canon SX610 HS and Olympus SH-3 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.
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
Canon SX610 HS
or the
Olympus SH-3 ,
including hyperfocal distance.