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Author Message   Jhstarz Tinkerer Username: Jhstarz Post Number: 10 Registered: 06-2012 Rating: N/A Votes: 0 Posted on Tuesday, June 12, 2012 - 08:54 am:    Glenn, I think I solved the mystery concerning the location pin you keep refering to, on this lens the locating pin the "ee pin " is retractable depending on the settings on the lens. Turning the diaphram ring to a manual aperture setting retracts the ee pin on the rear of the lens. So now that question is answered. Also on the cable release connection there is three contacts in that port.