Sony A390 has a
14.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor and features Bionz processor. On the other hand, Pentax K10D has a
10.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor .
Below you can see the A390 and K10D sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A390 and Pentax K10D Cameras
Sony A390 and Pentax K10D 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 (36.75µm 2 vs 26.30µm 2 ) compared to Sony A390, it has larger pixel area to collect light hence potential to 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
Sony A390
66
22.5 bits
11.5 Evs
607 ISO
Pentax K10D
66
22.7 bits
11.6 Evs
522 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
Sony A390
or the
Pentax K10D ,
including hyperfocal distance.
