Both Olympus TG-870 and Nikon S5200 have 16.0 MP resolution sensors but Olympus TG-870's sensor is 1/2.3-inch (6.16 x 4.62 mm ).
Since Nikon S5200's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Olympus TG-870.
Below you can see the TG-870 and S5200 sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus TG-870 and Nikon S5200 Cameras
Olympus TG-870 and Nikon S5200 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the 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
Olympus TG-870
or the
Nikon S5200 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
( versus 1/2.3-inch),
so compare them at the same framing rather than the same focal length.
Put the same focal length on the smaller sensor and it will show less depth of
field, not more, because it also crops tighter. The calculator shows the
full frame equivalent focal length for each body so you can match the framing.
