Both Nikon P7100 and Olympus XZ-1 have 10.0 MP resolution sensors but Nikon P7100's sensor is 1/1.7-inch (7.44 x 5.58 mm ) and Olympus XZ-1's sensor is 1/1.63-inch (8.07 x 5.56 mm ).
Since Olympus XZ-1'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 P7100.
Below you can see the P7100 and XZ-1 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon P7100 and Olympus XZ-1 Cameras
Nikon P7100 and Olympus XZ-1 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.
DxOMark Sensor Scores
Both Nikon P7100 and Olympus XZ-1 sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, P7100 has scored 41, 7 points higher than XZ-1.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Nikon P7100
41
19.4 bits
10.7 Evs
165 ISO
Olympus XZ-1
34
18.8 bits
10.4 Evs
117 ISO
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 P7100
or the
Olympus XZ-1 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(1/1.7-inch versus 1/1.63-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.
