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Message: <blockquote data-quote="BruceH" data-source="post: 3223405" data-attributes="member: 106398">Ads .... Now I understand!  That "divot" is an indented white mark used as a reference point for the diopter adjustment.  It is not bare metal.  I will see about taking a follow up photo with the focus knob pulled back and exposing the diopter wheel.Edit:  Photo added with the focus knob pull rearward, and showing the diopter wheel with a setting on the + side.   Once the diopter is set, then the focus knob is pushed forward (as shown in the earlier post) so the diopter wheel is protected from being moved and the focus mechanism gearing is re-engaged.</blockquote>