Nikon D4 has a
16.0MP Full frame (36 x 23.9 mm ) sized CMOS sensor and features Expeed 3 processor. On the other hand, Nikon D3X has a
25.0MP Full frame (35.9 x 24 mm ) sized CMOS sensor and features Expeed processor.
Nikon D3X's sensor provides 9MP more than Nikon D4'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 D4 and D3X sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D4 and Nikon D3X Cameras
Nikon D4 and Nikon D3X 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
Both Nikon D4 and Nikon D3X 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, D4 has scored 89, 1 points higher than D3X.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Nikon D4
89
24.7 bits
13.1 Evs
2965 ISO
Nikon D3X
88
24.7 bits
13.7 Evs
1992 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 D4
or the
Nikon D3X ,
including hyperfocal distance.
