Nikon NIKKOR Z 100-400mm f/4.5-5.6 VR S Lens - Manual (Page 30)

Rotating the Camera
After slightly loosening the tripod collar ring attachment screw ( ), rotate the
camera ( ) to align the lens rotation index with the tripod collar ring rotation
index that matches the desired orientation (landscape or portrait) and then
tighten the screw ( ).
Using the Tripod Collar
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