Olympus TG-4 has a
16.0MP (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features TruePic VII processor. On the other hand, Panasonic ZS50 has a
12.0MP (6.17 x 4.55 mm ) sized CMOS sensor .
Below you can see the TG-4 and ZS50 sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus TG-4 and Panasonic ZS50 Cameras
Olympus TG-4 and Panasonic ZS50 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 Panasonic ZS50 has 32% larger pixel area (2.34µm 2 vs 1.76µm 2 ) compared to Olympus TG-4, 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 TG-4
or the
Panasonic ZS50 ,
including hyperfocal distance.