Samsung ST80 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Samsung ST93 has a
16.0MP 1/2.3-inch (6.16 x 4.62 mm ) sized CCD sensor .
Below you can see the ST80 and ST93 sensor size comparison.
Samsung ST80 and Samsung ST93 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.