Both Canon T7 and Canon T6i 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 T6i sensor size comparison.
Sensor Size and Resolution Comparison image of Canon T7 and Canon T6i Cameras
Canon T7 and Canon T6i 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
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon T7
71
22.6 bits
11.9 Evs
1009 ISO
Canon T6i
71
22.7 bits
12.0 Evs
919 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 T7
or the
Canon T6i ,
including hyperfocal distance.
