Casio EX-S200 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Exilim Engine 5.0 processor. On the other hand, Nikon S9100 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Expeed C2 processor.
Below you can see the EX-S200 and S9100 sensor size comparison.
Sensor Size and Resolution Comparison image of Casio EX-S200 and Nikon S9100 Cameras
Casio EX-S200 and Nikon S9100 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.
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-S200
or the
Nikon S9100 ,
including hyperfocal distance.