Both Casio EX-FH100 and Nikon S31 have 10.0 MP resolution sensors but Casio EX-FH100's sensor is 1/2.3-inch (6.17 x 4.55 mm ) and Nikon S31's sensor is 1/2.9-inch (4.96 x 3.72 mm ).
Since Casio EX-FH100'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 S31.
Below you can see the EX-FH100 and S31 sensor size comparison.
Sensor Size and Resolution Comparison image of Casio EX-FH100 and Nikon S31 Cameras
As seen above, Casio EX-FH100 has a 1.5x Larger sensor area than Nikon S31. 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
Casio EX-FH100
or the
Nikon S31 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(1/2.3-inch versus 1/2.9-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.
