Nikon TC-1 2x teleconverter for Nikon FNikon TC 1 2x teleconverter for Nikon F mount lenses. This is a manual focus teleconverter with a pre AI pin coupling system for metering. Because this is a standard F mount teleconverter, it will fit most F mount lenses but because it uses pin coupling, it won't transmit metering information on cameras that use the AI system, including any DSLRs. It can be used in stopped down mode for metering. In excellent working order, with some cosmetic wear on