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FD Mount Question - Purpose of cam shaped lever?

Discussion in 'Adapted Lenses' started by HarryS, Nov 20, 2014.

  1. HarryS

    HarryS Mu-43 Top Veteran

    919
    Jun 23, 2012
    Midwest, USA
    My FD 50mm 1.8 SC had this lever. Not on my FD 85 or 135. Anyone know its purpose?
     

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