AF calculation per second is now treated as a standard to determine the autofocusing capability of a camera.
Nikon Z9 and Z8 have a common AF calculation speed which is 120 frames calculation per second. The same AF speed is being spotted on the Sony Alpha A1 camera, the Sony Alpha A1 camera is also able to do 120 frames AF calculation per second.
The fastest Canon camera (as of May 2023), the Canon R3, is able to do 60 AF calculations per second according to Canon.
Despite the fact that the Canon R3 is able to shoot up to 195 frames per second, it doesn’t mean the sensor is doing autofocus calculations for every frame. The AF calculation speed is only limited to 60 frames and if the camera shoots up to 190 frames per second it means the camera refreshes its autofocus after every 3 to 4 frames at max shooting speed.
But this is not the case with the Nikon Z8 camera. Even if you are shooting at its max burst speed which is 120 frames per second at 11 megapixels, the sensor is able to refresh and recalculate its AF in every single frame.
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