Nikon S4100 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Expeed C2 processor. On the other hand, Canon Elph 115 IS has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features DIGIC 5 processor.
Below you can see the S4100 and Elph 115 IS sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon S4100 and Canon Elph 115 IS Cameras
Nikon S4100 and Canon Elph 115 IS have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Nikon S4100 has 14% larger pixel area compared to Canon Elph 115 IS, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
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 S4100
or the
Canon Elph 115 IS ,
including hyperfocal distance.
