Nikon edg 10x32 Mode D'Emploi

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Diopter Adjustment
6  When the subject changes, refocus the new subject by rotating 
the focusing ring ① .
  ・Rotate clockwise to focus on a more distant subject.
  ・Rotate counterclockwise to focus on a closer subject.
7  When focusing is not necessary, set the focusing ring ① in 
the middle position (unlocked), so that it doesn't change the 
focusing position even if you accidentally touch it.