The issue: I am using a Nikon D4s and all of the sudden, none of my lenses will autofocus in the viewfinder mode. It maxes out and then comes back to infinity. So every time, the background basically focuses but not the subject. However, in live view mode, it focuses flawlessly and sharp. I do not have this issue in my Nikon D7500. Any ideas why it won’t work unless in live view? I have checked all of my AF settings and it’s the way it needs to.
Just to clarify.
1: All of the standard checks for auto focus issues have been done.
2: All Nikon and Sigma lenses did work before, none will now (when in auto using viewfinder).
3:All of these lenses work perfectly on my D7500.
4: My original guess is maybe the Phase Detect Autofocus Sensor? But don’t know how to go about checking that.
5: still works in manual mode and auto when using the live view.