Sigma SD15 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, Sigma SD10 has a
3.0MP APS-C (20.7 x 13.8 mm ) sized CMOS (Foveon X3) sensor .
Another similarity between these two cameras is that both Sigma SD10 and Sigma SD15 sensors lack anti-alias (Low-Pass) filters. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the SD15 and SD10 sensor size comparison.
Sensor Size and Resolution Comparison image of Sigma SD15 and Sigma SD10 Cameras
Sigma SD15 and Sigma SD10 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 Sigma SD10 has 35% larger pixel area (83.28µm 2 vs 61.43µm 2 ) compared to Sigma SD15, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.
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 SD15
or the
Sigma SD10 ,
including hyperfocal distance.
