Both Nikon P530 and Olympus E-PL7 have 16.0 MP resolution sensors but Nikon P530's sensor is 1/2.3-inch (6.17 x 4.55 mm ) and Olympus E-PL7's sensor is Four Thirds (17.3 x 13 mm ).
Since Olympus E-PL7'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 Nikon P530.
Below you can see the P530 and E-PL7 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon P530 and Olympus E-PL7 Cameras
As seen above, Olympus E-PL7 has a 8.0x Larger sensor area than Nikon P530. 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
Nikon P530
or the
Olympus E-PL7 ,
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.
