Using The Tripod Collar Ring - Nikon NIKKOR Z 800mm f/6.3 VR S Reference Manual

Using the Tripod Collar Ring

Attach tripods to the lens tripod collar, not to the camera.
Attaching tripods to the lens 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.
1.
Loosen the tripod collar ring attachment screw (q).
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Using the Tripod Collar Ring