Fujifilm S8100fd has a
10.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, FujiFilm S2950 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor .
Below you can see the S8100fd and S2950 sensor size comparison.
Fujifilm S8100fd and FujiFilm S2950 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.