Both Sony A7S and Sony A7S III have Full frame sized 12.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the A7S and A7S III sensor size comparison.
Sony A7S and Sony A7S III 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 A7S and Sony A7S III 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, A7S has scored 87, 2 points higher than A7S III.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A7S |
87 |
23.9 bits |
13.2 Evs |
3702 ISO |
Sony A7S III |
85 |
24.2 bits |
13.4 Evs |
3900 ISO |