Eye-detection AF is now available during video recording.
Improved eye-detection performance for [Auto-area AF].
Improved the refresh rate for the focus points displayed in live view during subject-tracking and face/eye-detection AF.
Info from Nikon Rumors
I shoot mirrorless with Olympus cameras. I do not own or ever used a Z50.
I have read good information on this camera for general photography but it tends to fail when it comes to AF for action or wildlife photography. Its tracking feature, from what I know, is not to a par with that on the Z6 just to give you an example.
Will Nikon improve the AF for wildlife through a software update if it can be done? I do not really know.
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