Casio EX-Z90 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Digic 4 processor. On the other hand, Sony H50 has a
9.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the EX-Z90 and H50 sensor size comparison.
Sensor Size and Resolution Comparison image of Casio EX-Z90 and Sony H50 Cameras
Casio EX-Z90 and Sony H50 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 H50 has 33% larger pixel area (3.13µm 2 vs 2.34µm 2 ) compared to Casio EX-Z90, 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-Z90
or the
Sony H50 ,
including hyperfocal distance.