Both Canon 4000D and Canon T6 have APS-C sized 18.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the 4000D and T6 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 4000D and Canon T6 Cameras
Canon 4000D and Canon T6 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 4000D and Canon T6 sensors have been tested by DxO and the results show that T6 has a better overall score of 66, 3 points higher compared to 4000D's score of 63.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 4000D
63
21.9 bits
11.4 Evs
695 ISO
Canon T6
66
22.0 bits
11.7 Evs
781 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 4000D
or the
Canon T6 ,
including hyperfocal distance.
