Both Canon M100 and Sony A77 have 24.0 MP resolution sensors but Canon M100's sensor is APS-C (22.3 x 14.9 mm ) and Sony A77's sensor is APS-C (23.5 x 15.6 mm ).
Since Sony A77'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 M100.
Below you can see the M100 and A77 sensor size comparison.
As seen above, Sony A77 has a 1.1x Larger sensor area than Canon M100. 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 M100 and Sony A77 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, M100 has scored 79, 1 points higher than A77.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon M100 |
79 |
23.5 bits |
13.0 Evs |
1272 ISO |
Sony A77 |
78 |
24.0 bits |
13.2 Evs |
801 ISO |