Panasonic LZ20 has a
16.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . On the other hand, Panasonic FX48 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor .
Below you can see the LZ20 and FX48 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic LZ20 and Panasonic FX48 Cameras
Panasonic LZ20 and Panasonic FX48 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 Panasonic FX48 has 32% larger pixel area (2.31µm 2 vs 1.74µm 2 ) compared to Panasonic LZ20, 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 LZ20
or the
Panasonic FX48 ,
including hyperfocal distance.