Both Canon SL2 and Canon 77D 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 77D sensor size comparison.
Sensor Size and Resolution Comparison image of Canon SL2 and Canon 77D Cameras
Canon SL2 and Canon 77D have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.
DxOMark Sensor Scores
Both Canon SL2 and Canon 77D 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 77D.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon SL2
79
23.6 bits
13.4 Evs
1041 ISO
Canon 77D
78
23.6 bits
13.3 Evs
971 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
Canon 77D ,
including hyperfocal distance.
