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Author Message   Sillyconguru Tinkerer Username: Sillyconguru Post Number: 47 Registered: 12-2007 Rating: N/A Votes: 0 Posted on Thursday, March 21, 2013 - 05:09 pm:    The cut-out is just visible when a (AI/AI-S/AI-P/AF/AF-D) lens is mounted; look closely at the part of the mount by the lens release button (with the aperture set a couple of stops off maximum) and you should see the locking pin. This doesn't work with pre-AI lenses due to the shape of the aperture ring.