Both Canon T7 and Sony A77 II have APS-C sized 24.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the T7 and A77 II sensor size comparison.
As seen above, Sony A77 II has a 1.1x Larger sensor area than Canon T7. 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
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It 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. Canon T7 and Sony A77 II sensors have been tested by DxO and the results show that A77 II has a better overall score of 82, 11 points higher compared to T7's score of 71.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon T7 |
71 |
22.6 bits |
11.9 Evs |
1009 ISO |
Sony A77 II |
82 |
24.4 bits |
13.4 Evs |
1013 ISO |