Pentax K10D has a
10.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor . On the other hand, Sony A390 has a
14.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor and features Bionz processor.
Below you can see the K10D and A390 sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K10D and Sony A390 Cameras
Pentax K10D and Sony A390 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 K10D has 39% larger pixel area compared to Sony A390, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
DxOMark Sensor Scores
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Pentax K10D
66
22.7 bits
11.6 Evs
522 ISO
Sony A390
66
22.5 bits
11.5 Evs
607 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 K10D
or the
Sony A390 ,
including hyperfocal distance.
