Panasonic ZR3 has a
14.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Venus Engine HD II processor. On the other hand, Panasonic ZS3 has a
10.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor .
Below you can see the ZR3 and ZS3 sensor size comparison.
Sensor Size and Resolution Comparison image of Panasonic ZR3 and Panasonic ZS3 Cameras
Panasonic ZR3 and Panasonic ZS3 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 ZS3 has 40% larger pixel area (2.78µm 2 vs 1.98µm 2 ) compared to Panasonic ZR3, 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 ZR3
or the
Panasonic ZS3 ,
including hyperfocal distance.