F lenses are hard to find used, and presumably impossible to find new. They aren't exactly attractive, and they don't have the build quality of even the A lenses. Manual focus with them is not great (in common with early AF lenses from other manufacturers). Most of the good ones appear to be optically identical to the A versions. All of these seem to be valid reasons why the F lenses are unpopular.
I believe their regular F primes were built well, certainly better than FA lenses. They may have plastic shells, but metal inside.
Really the only NEW F primes I can think of are the 300/4.5 and the 135/2.8, both of which are well regarded, and the 600/4 which we understandably don't hear much about.
You missed the macros, and the F*250-600/5.6 too.
Alan Chan http://www.pbase.com/wlachan
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