Nikon NIKKOR Z 800mm f/6.3 VR S Lens - Manual (Page 15)

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Memory set button
Save the current focus position. The saved position can be instantly
restored by pressing a control to which [Recall focus position] has been
assigned (“memory recall”).
0 “Memory Recall” (p.28)
Tripod collar
Attach a tripod. For information on removing the tripod collar, contact a
Nikon-authorized service representative.
0 “Using the Tripod Collar Ring” (p.30)
Parts of the Lens: Names and Functions
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