Both Pentax K200D and Fujifilm Z30 have 10.0 MP resolution sensors but Pentax K200D's sensor is APS-C (23.5 x 15.7 mm ) and Fujifilm Z30's sensor is 1/2.3-inch (6.17 x 4.55 mm ).
Since Pentax K200D's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Fujifilm Z30.
Below you can see the K200D and Z30 sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K200D and Fujifilm Z30 Cameras
As seen above, Pentax K200D has a 13.1x Larger sensor area than Fujifilm Z30. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.
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
Fujifilm Z30 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(APS-C versus 1/2.3-inch),
so compare them at the same framing rather than the same focal length.
Put the same focal length on the smaller sensor and it will show less depth of
field, not more, because it also crops tighter. The calculator shows the
full frame equivalent focal length for each body so you can match the framing.
