Sigma DP2x has a
5.0MP APS-C (20.7 x 13.8 mm ) sized CMOS (Foveon X3) sensor and features True II processor. On the other hand, Sony A290 has a
14.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor and features Bionz processor.
Sony A290's sensor provides 9MP more than Sigma DP2x'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 DP2x and A290 sensor size comparison.
Sensor Size and Resolution Comparison image of Sigma DP2x and Sony A290 Cameras
As seen above, Sony A290 has a 1.3x Larger sensor area than Sigma DP2x. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.
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
Sigma DP2x
or the
Sony A290 ,
including hyperfocal distance.
