Nikon D3100 has a
14.0MP APS-C (23.1 x 15.4 mm ) sized CMOS sensor and features Expeed 2 processor. On the other hand, Pentax K200D has a
10.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor .
Below you can see the D3100 and K200D sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D3100 and Pentax K200D Cameras
Nikon D3100 and Pentax K200D have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
DxOMark Sensor Scores
Both Nikon D3100 and Pentax K200D sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, D3100 has scored 67, 3 points higher than K200D.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Nikon D3100
67
22.5 bits
11.3 Evs
919 ISO
Pentax K200D
64
22.4 bits
11.4 Evs
561 ISO
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 D3100
or the
Pentax K200D ,
including hyperfocal distance.
