Sony A99 has a
24.0MP Full frame (35.8 x 23.8 mm ) sized CMOS sensor and features Bionz processor. On the other hand, Nikon D3S has a
12.0MP Full frame (36 x 23.9 mm ) sized CMOS sensor and features Expeed processor.
Sony A99's sensor provides 12MP more than Nikon D3S'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 A99 and D3S sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A99 and Nikon D3S Cameras
Sony A99 and Nikon D3S 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 Sony A99 and Nikon D3S 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, A99 has scored 89, 7 points higher than D3S.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A99
89
25.0 bits
14.0 Evs
1555 ISO
Nikon D3S
82
23.5 bits
12.0 Evs
3253 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
Sony A99
or the
Nikon D3S ,
including hyperfocal distance.
