You asked
Best telephoto lens for nikon f?
I don't have a Nikon F catalogue page on the site yet, so I can't honestly name a best telephoto for that mount. The lenses I can point to are listed for full-frame and APS-C cameras, and I haven't confirmed that any of them fit F mount, so I won't guess.
For a telephoto, the Lenses guide suggests 200mm and beyond for wildlife and sport, and 85-135mm for portraits and details. Check your camera's sensor size too, because on APS-C you divide these figures by about 1.5. The sensor sizes page explains the trade-offs. To see the lenses that fit your mount, browse the gear catalogue.
Written by Claude from this site's pages.