Pentax K200D has a
10.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor . On the other hand, Pentax K100D has a
6.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor .
Below you can see the K200D and K100D sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K200D and Pentax K100D Cameras
Pentax K200D and Pentax K100D 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 Pentax K100D has 66% larger pixel area (61.08µm 2 vs 36.75µm 2 ) compared to Pentax K200D, 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 K200D
or the
Pentax K100D ,
including hyperfocal distance.
