Nikon Lens problem?

Nikon Lens problem? This is my recently acquired nikon 70-210 F4 you can see this while looking through the lens, it looks like it’s infront of the aperture (looking from the back of the lens) it doesn’t rotate when the focus is changed and doesn’t move when the zoom is changed, any ideas what it might be?
submitted by /u/PartialLaugh

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