FujiFilm S2500HD has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Samsung ST6500 has a
16.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor .
Below you can see the S2500HD and ST6500 sensor size comparison.
Sensor Size and Resolution Comparison image of FujiFilm S2500HD and Samsung ST6500 Cameras
FujiFilm S2500HD and Samsung ST6500 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the 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
FujiFilm S2500HD
or the
Samsung ST6500 ,
including hyperfocal distance.