Both Canon SL2 and Sony A77 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 SL2 and A77 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon SL2 and Sony A77 Cameras
As seen above, Sony A77 has a 1.1x Larger sensor area than Canon SL2. 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 SL2 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, SL2 has scored 79, 1 points higher than A77.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon SL2
79
23.6 bits
13.4 Evs
1041 ISO
Sony A77
78
24.0 bits
13.2 Evs
801 ISO
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 SL2
or the
Sony A77 ,
including hyperfocal distance.
