Casio EX-ZR15 has a
16.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor and features Exilim Engine 5.0 processor. On the other hand, Sony W330 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the EX-ZR15 and W330 sensor size comparison.
Sensor Size and Resolution Comparison image of Casio EX-ZR15 and Sony W330 Cameras
Casio EX-ZR15 and Sony W330 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 Sony W330 has 14% larger pixel area (2.01µm 2 vs 1.76µm 2 ) compared to Casio EX-ZR15, it has larger pixel area to collect light hence potential to 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
Casio EX-ZR15
or the
Sony W330 ,
including hyperfocal distance.