Both Canon 1100D and Canon G15 have 12.0 MP resolution sensors but Canon 1100D's sensor is APS-C (22.2 x 14.8 mm ) and Canon G15's sensor is 1/1.7-inch (7.44 x 5.58 mm ).
Since Canon 1100D's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Canon G15.
Below you can see the 1100D and G15 sensor size comparison.
As seen above, Canon 1100D has a 7.9x Larger sensor area than Canon G15. 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.
DxOMark Sensor Scores
Both Canon 1100D and Canon G15 sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, 1100D has scored 62, 16 points higher than G15.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 1100D |
62 |
21.9 bits |
11.0 Evs |
755 ISO |
Canon G15 |
46 |
19.9 bits |
11.5 Evs |
165 ISO |