Nikon D90 has a
12.0MP APS-C (23.6 x 15.8 mm ) sized CMOS sensor . On the other hand, Sony A230 has a
10.0MP APS-C (23.5 x 15.7 mm ) sized CCD sensor and features Bionz processor.
Below you can see the D90 and A230 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon D90 and Sony A230 Cameras
Nikon D90 and Sony A230 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 D90 and Sony A230 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, D90 has scored 73, 10 points higher than A230.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Nikon D90
73
22.7 bits
12.5 Evs
977 ISO
Sony A230
63
22.3 bits
11.4 Evs
531 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 D90
or the
Sony A230 ,
including hyperfocal distance.
