Canon 100D has a
18.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features Digic 5 processor. On the other hand, Canon SD990 IS has a
15.0MP 1/1.7-inch (7.44 x 5.58 mm ) sized CCD sensor .
Below you can see the 100D and SD990 IS sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 100D and Canon SD990 IS Cameras
As seen above, Canon 100D has a 8.0x Larger sensor area than Canon SD990 IS. 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
Canon 100D
or the
Canon SD990 IS ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(APS-C versus 1/1.7-inch),
so compare them at the same framing rather than the same focal length.
Put the same focal length on the smaller sensor and it will show less depth of
field, not more, because it also crops tighter. The calculator shows the
full frame equivalent focal length for each body so you can match the framing.
