Nikon D40X has a 10.0MP APS-C (23.7 x 15.6 mm ) sized CCD sensor and features Expeed processor. On the other hand, Sony A57 has a 16.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor .
Sony A57's sensor provides 6MP more than Nikon D40X'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 D40X and A57 sensor size comparison.
![Nikon D40X vs Sony A57 Sensor Size Comparison]()
Sensor Size and Resolution Comparison image of Nikon D40X and Sony A57 Cameras
Nikon D40X and Sony A57 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
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. Nikon D40X and Sony A57 sensors have been tested by DxO and the results show that A57 has a better overall score of 75, 12 points higher compared to D40X's score of 63.
| Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
|
Nikon D40X |
63 |
22.4 bits |
11.4 Evs |
516 ISO |
|
Sony A57 |
75 |
23.4 bits |
13.0 Evs |
785 ISO |