Ricoh GXR GR Lens A12 28mm has a
12.0MP APS-C (23.6 x 15.7 mm ) sized CMOS sensor and features GR Engine III processor. On the other hand, Sigma DP2 Quattro has a
20.0MP APS-C (23.5 x 15.7 mm ) sized CMOS (Foveon X3) sensor and features TRUE III engine processor.
Sigma DP2 Quattro's sensor provides 8MP more than Ricoh GXR GR Lens A12 28mm'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 GXR GR Lens A12 28mm F2.5 and DP2 Quattro sensor size comparison.
Sensor Size and Resolution Comparison image of Ricoh GXR GR Lens A12 28mm and Sigma DP2 Quattro Cameras
Ricoh GXR GR Lens A12 28mm and Sigma DP2 Quattro 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.
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
Ricoh GXR GR Lens A12 28mm
or the
Sigma DP2 Quattro ,
including hyperfocal distance.
