Both Pentax WG-3 GPS and Olympus E-M10 II have 16.0 MP resolution sensors but Pentax WG-3 GPS's sensor is 1/2.3-inch (6.17 x 4.55 mm ) and Olympus E-M10 II's sensor is Four Thirds (17.3 x 13 mm ).
Since Olympus E-M10 II'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 Pentax WG-3 GPS.
Below you can see the WG-3 GPS and E-M10 II sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax WG-3 GPS and Olympus E-M10 II Cameras
As seen above, Olympus E-M10 II has a 8.0x Larger sensor area than Pentax WG-3 GPS. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in 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
Pentax WG-3 GPS
or the
Olympus E-M10 II ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(1/2.3-inch versus Four Thirds),
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.
