Nikon NIKKOR Z 400mm f/2.8 TC VR S Lens - Manual (Page 35)

Using the Tripod Collar
Attach tripods to the built-in rotating tripod collar, not to the camera.
Attaching tripods to the built-in rotating tripod collar rather than to the camera
allows the camera to be rotated as described below to take pictures in “tall” or
“wide” orientation while a tripod is attached.
Loosen the tripod collar ring attachment screw ( ).
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Using the Tripod Collar
1.