The Nikon’s popular camera D850(B&H/Amazon/Adorama) ‘s image sensor is made by Sony, confirmed by Astrocn.org, the sensor of Nikon D850 camera is IMX309AQJ, which is made by Sony.
And the a7R III(Amazon/B&H/Adorama) has the same sensor as previous a7R II, they both have Sony’s IMX251AQL sensor.
