Both Nikon D90 and Nikon D300S have APS-C sized 12.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the D90 and D300S sensor size comparison.
Nikon D90 and Nikon D300S have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.
DxOMark Sensor Scores
Both Nikon D90 and Nikon D300S 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, 3 points higher than D300S.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Nikon D90 |
73 |
22.7 bits |
12.5 Evs |
977 ISO |
Nikon D300S |
70 |
22.5 bits |
12.2 Evs |
787 ISO |