Both Canon 400D and Nikon D3000 have APS-C sized 10.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the 400D and D3000 sensor size comparison.
As seen above, Nikon D3000 has a 1.1x Larger sensor area than Canon 400D. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in 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 400D |
62 |
22.1 bits |
11.0 Evs |
664 ISO |
Nikon D3000 |
62 |
22.3 bits |
11.1 Evs |
563 ISO |