In article <332BBA75.1BCC@po.cwru.edu>, dga2@po.cwru.edu says...

>From all I've heard, the 300mm f/4 isn't too great on converters. The
>only such lens that I've seen rated highly on the TC14, TC14b or TC14c
>is the 300mm f/4.5 ED NON-IF, but this lens is very rare. The later IF
>version is supposedly not so hot on converters either.
[....]

I have tried two samples of the 300mm f4 AF Nikkor on converters.
I was not impressed with the first on the TC14/14B or TC300/301,
but the second one was very good on both the TC14C and TC300/301
(both lenses looked good without the converters...). I did not
like the 300mm f4.5 Nikkors on converters, except for one
sample of the unusual 300mm f4.5 ED non-IF Nikkor.
Hope This Helps