Panasonic FH22 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Nikon P90 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor .
Below you can see the FH22 and P90 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic FH22 and Nikon P90 Cameras
Panasonic FH22 and Nikon P90 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 Nikon P90 has 16% larger pixel area (2.31µm 2 vs 1.98µm 2 ) compared to Panasonic FH22, 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
Panasonic FH22
or the
Nikon P90 ,
including hyperfocal distance.