Pentax K20D has a
15.0MP APS-C (23.4 x 15.6 mm ) sized CMOS sensor . On the other hand, Pentax K10D has a
10.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor .
Pentax K20D's sensor provides 5MP more than Pentax K10D's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the K20D and K10D sensor size comparison.
Pentax K20D and Pentax K10D 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
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It 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. Pentax K20D and Pentax K10D sensors have been tested by DxO and the results show that K10D has a better overall score of 66, 1 points higher compared to K20D's score of 65.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Pentax K20D |
65 |
22.9 bits |
11.1 Evs |
639 ISO |
Pentax K10D |
66 |
22.7 bits |
11.6 Evs |
522 ISO |