Sony A7S III has a
12.0MP Full frame (35.6 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz XR processor. On the other hand, Nikon D750 has a
24.0MP Full frame (35.9 x 24 mm ) sized CMOS sensor and features Expeed 4 processor.
Nikon D750's sensor provides 12MP more than Sony A7S III'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 A7S III and D750 sensor size comparison.
Sony A7S III and Nikon D750 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
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It 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. Sony A7S III and Nikon D750 sensors have been tested by DxO and the results show that D750 has a better overall score of 93, 8 points higher compared to A7S III's score of 85.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A7S III |
85 |
24.2 bits |
13.4 Evs |
3900 ISO |
Nikon D750 |
93 |
24.8 bits |
14.5 Evs |
2956 ISO |