Pentax X-5 has a
16.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized BSI-CMOS sensor . On the other hand, Nikon S640 has a
12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor and features Expeed processor.
Below you can see the X-5 and S640 sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax X-5 and Nikon S640 Cameras
Pentax X-5 and Nikon S640 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 (2.31µm 2 vs 1.74µm 2 ) compared to Pentax X-5, 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
Pentax X-5
or the
Nikon S640 ,
including hyperfocal distance.
