Nikon S640 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Expeed processor. On the other hand, Panasonic ZS35 has a
16.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CMOS sensor .
Below you can see the S640 and ZS35 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon S640 and Panasonic ZS35 Cameras
Nikon S640 and Panasonic ZS35 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 S640 has 32% larger pixel area compared to Panasonic ZS35, it has potential to collect more light on pixel level hence 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
Nikon S640
or the
Panasonic ZS35 ,
including hyperfocal distance.
