Both Canon T6s and Canon SL2 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 T6s and SL2 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon T6s and Canon SL2 Cameras
Canon T6s and Canon SL2 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
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 T6s and Canon SL2 sensors have been tested by DxO and the results show that SL2 has a better overall score of 79, 9 points higher compared to T6s's score of 70.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon T6s
70
22.6 bits
12.0 Evs
915 ISO
Canon SL2
79
23.6 bits
13.4 Evs
1041 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 T6s
or the
Canon SL2 ,
including hyperfocal distance.
