Both Canon 650D and Canon 4000D have 18.0 MP resolution sensors but Canon 650D's sensor is APS-C (22.3 x 14.9 mm ) and Canon 4000D's sensor is APS-C (22.3 x 14.9 mm ).
Since Canon 4000D's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Canon 650D.
Below you can see the 650D and 4000D sensor size comparison.
Canon 650D and Canon 4000D 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 650D and Canon 4000D sensors have been tested by DxO and the results show that 4000D has a better overall score of 63, 1 points higher compared to 650D's score of 62.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 650D |
62 |
21.7 bits |
11.2 Evs |
722 ISO |
Canon 4000D |
63 |
21.9 bits |
11.4 Evs |
695 ISO |