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, Nikon D90 has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor .
Below you can see the D40X and D90 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D40X and Nikon D90 Cameras
Nikon D40X and Nikon D90 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 D40X and Nikon D90 sensors have been tested by DxO and the results show that D90 has a better overall score of 73, 10 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
Nikon D90
73
22.7 bits
12.5 Evs
977 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 D40X
or the
Nikon D90 ,
including hyperfocal distance.
