Nikon D100 has a
6.0MP APS-C (23.7 x 15.5 mm ) sized CCD sensor . On the other hand, Sigma DP2x has a
5.0MP APS-C (20.7 x 13.8 mm ) sized CMOS (Foveon X3) sensor and features True II processor.
Below you can see the D100 and DP2x sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D100 and Sigma DP2x Cameras
As seen above, Nikon D100 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
Nikon D100
or the
Sigma DP2x ,
including hyperfocal distance.
