Nikon D3000 has a 10.0MP APS-C (23.6 x 15.8 mm ) sized CCD sensor and features Expeed processor. On the other hand, Nikon D40 has a 6.0MP APS-C (23.7 x 15.5 mm ) sized CCD sensor .
Below you can see the D3000 and D40 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D3000 and Nikon D40 Cameras
Nikon D3000 and Nikon D40 have almost the same sensor size so none of them has any significant advantage over other in providing control over depth of field when used with same focal length and aperture.
DxOMark Sensor Scores
Both Nikon D3000 and Nikon D40 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, D3000 has scored 62, 6 points higher than D40.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Nikon D3000 |
62 |
22.3 bits |
11.1 Evs |
563 ISO |
Nikon D40 |
56 |
21.0 bits |
11.0 Evs |
561 ISO |