Both Canon 20D and Canon 30D have APS-C sized 8.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the 20D and 30D sensor size comparison.
Canon 20D and Canon 30D 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 20D and Canon 30D 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, 20D has scored 62, 3 points higher than 30D.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 20D |
62 |
21.9 bits |
11.0 Evs |
721 ISO |
Canon 30D |
59 |
21.5 bits |
10.8 Evs |
736 ISO |