Both Canon 77D and Sony A65 have 24.0 MP resolution sensors but Canon 77D's sensor is APS-C (22.3 x 14.9 mm ) and Sony A65's sensor is APS-C (23.5 x 15.6 mm ).
Since Sony A65'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 77D.
Below you can see the 77D and A65 sensor size comparison.
As seen above, Sony A65 has a 1.1x Larger sensor area than Canon 77D. 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 77D and Sony A65 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, 77D has scored 78, 4 points higher than A65.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 77D |
78 |
23.6 bits |
13.3 Evs |
971 ISO |
Sony A65 |
74 |
23.4 bits |
12.6 Evs |
717 ISO |