Nikon D40 has a
6.0MP APS-C (23.7 x 15.5 mm ) sized CCD sensor . On the other hand, Nikon D40X has a
10.0MP APS-C (23.7 x 15.6 mm ) sized CCD sensor and features Expeed processor.
Below you can see the D40 and D40X sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D40 and Nikon D40X Cameras
Nikon D40 and Nikon D40X 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. Nikon D40 and Nikon D40X sensors have been tested by DxO and the results show that D40X has a better overall score of 63, 7 points higher compared to D40's score of 56.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Nikon D40
56
21.0 bits
11.0 Evs
561 ISO
Nikon D40X
63
22.4 bits
11.4 Evs
516 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Nikon D40
or the
Nikon D40X ,
including hyperfocal distance.
