Canon 300D has a
6.0MP APS-C (22.7 x 15.1 mm ) sized CMOS sensor . On the other hand, Canon 500D has a
15.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features Digic 4 processor.
Canon 500D's sensor provides 9MP more than Canon 300D's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the 300D and 500D sensor size comparison.
Canon 300D and Canon 500D 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 500D sensors have been tested by DxO and the results show that 500D has a better overall score of 63, 8 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 500D |
63 |
21.7 bits |
11.5 Evs |
663 ISO |