Panasonic SZ7 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CMOS sensor . On the other hand, Panasonic ZS7 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Venus Engine HD II processor.
Below you can see the SZ7 and ZS7 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic SZ7 and Panasonic ZS7 Cameras
Panasonic SZ7 and Panasonic ZS7 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 ZS7 has 16% larger pixel area (2.31µm 2 vs 1.98µm 2 ) compared to Panasonic SZ7, 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 SZ7
or the
Panasonic ZS7 ,
including hyperfocal distance.