Canon 300D has a
6.0MP APS-C (22.7 x 15.1 mm ) sized CMOS sensor . On the other hand, Canon 20D has a
8.0MP APS-C (22.5 x 15 mm ) sized CMOS sensor .
Below you can see the 300D and 20D sensor size comparison.
Canon 300D and Canon 20D have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the 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 300D and Canon 20D sensors have been tested by DxO and the results show that 20D has a better overall score of 62, 7 points higher compared to 300D's score of 55.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Canon 300D |
55 |
21.0 bits |
10.8 Evs |
544 ISO |
Canon 20D |
62 |
21.9 bits |
11.0 Evs |
721 ISO |