Nikon Z7 has a
46.0MP Full frame (35.9 x 23.9 mm ) sized BSI-CMOS sensor and features Expeed 6 processor. On the other hand, Sony A7R III has a
42.0MP Full frame (35.9 x 24 mm ) sized BSI-CMOS sensor and features Bionz X processor.
Another similarity between these two cameras is that both Sony A7R III and Nikon Z7 sensors lack anti-alias (Low-Pass) filters. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the Z7 and A7R III sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon Z7 and Sony A7R III Cameras
Nikon Z7 and Sony A7R 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
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. Nikon Z7 and Sony A7R III sensors have been tested by DxO and the results show that A7R III has a better overall score of 100, 1 points higher compared to Z7's score of 99.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Nikon Z7
99
26.3 bits
14.6 Evs
2668 ISO
Sony A7R III
100
26.0 bits
14.7 Evs
3523 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 Z7
or the
Sony A7R III ,
including hyperfocal distance.
