The updates were in response to user complaints that the focus-by-wire or non-linear focusing in Z mount lenses becomes laggy and prone to overshooting their focus targets. By adding linear manual focus, pulling focus becomes more accurate and easier to implement.
Nikon’s Z mount mirrorless lenses utilize a focus by wire system in autofocus mode, which employs an electronic motor to move the lens elements in and out of focus. This is different from a manual focus ring rotation manipulating the elements and moving them back and forth with a mechanical ring rotation.
Manual linear focus rings generally go from minimum focusing distance to infinity with a set stop on either end. This enables the lens to rotate a set amount, say 270-degreees. Whereas, a focusing by wire system will enable a constant rotation of the focusing ring with no stops during manual focus. This makes it much more difficult to “pull focus” when shooting video since the faster the ring is spun, the faster the focus will pull, and in some focus by wire lenses, there is only a digital readout, not a printed scale on the lens to go by.
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