Nikon D70 has a
6.0MP APS-C (23.7 x 15.5 mm ) sized CCD sensor . On the other hand, Sigma DP2s 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 D70 and DP2s sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D70 and Sigma DP2s Cameras
As seen above, Nikon D70 has a 1.3x Larger sensor area than Sigma DP2s. 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 D70
or the
Sigma DP2s ,
including hyperfocal distance.
