Pentax K-30 has a
16.0MP APS-C (23.7 x 15.7 mm ) sized CMOS sensor and features Prime M processor. On the other hand, Pentax K20D has a
15.0MP APS-C (23.4 x 15.6 mm ) sized CMOS sensor .
Below you can see the K-30 and K20D sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K-30 and Pentax K20D Cameras
Pentax K-30 and Pentax K20D 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 Pentax K-30 and Pentax K20D 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, K-30 has scored 79, 14 points higher than K20D.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Pentax K-30
79
23.7 bits
13.0 Evs
1129 ISO
Pentax K20D
65
22.9 bits
11.1 Evs
639 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
Pentax K-30
or the
Pentax K20D ,
including hyperfocal distance.
