Nikon AF Teleconverter TC-16A for Nikon F mount.  This unique teleconverter gives autofocus capabilities to many F mount manual focus lenses!  When used on a suitable camera body, this teleconverter dials in focus automatically after manually focusing to the general distance.  Compatibility is limited however: Nikon recommends the TC-16A only with the F-501/N2020, but several other bodies including the F4 and F/N90 work as well.  Please confirm compatibility with your intended camera body.  In great shape, with clean glass and minor body wear.