In article <5d66tr$9j7@nntp.Stanford.EDU>, philduke@leland.stanford.edu says...

>Does the original Nikon F system include a teleconverter? What about the
>coupling prong? Thanks in advance for any info.

They are hard to find, but 2X pre-AI Nikon converters were made
(the TC-1 and TC-2, as I recall, for shorter-than-300mm, and longer)
which used the coupling-prong system. If your lenses are AI, the
later-style converters can be used on pre-AI bodies by using
"stop-down" metering.
Hope This Helps