TAMRON SP 500mm f/8 TELE MACRO  BBAR MC 55BB 2x CONV. MIRROR LENS. COMES WITH ORIGINAL CASE, FRONT AND NIKON REAR CAP, TAMRON HOOD, FILTER AND NEW SCREW DRIVER AND ADAPTER IN ORIGINAL PACKAGING.  SAYS N/AI ON REAR RING NIKON MOUNT? THANK YOU FOR LOOKING.