Putting the older lenses on a Nikon DSLR gives one an instant realization just how terrific these older lenses are.
The pro Ai-s lenses that ran concurrent with the F3 are as good as anything sold today. IMHO.
Pretty much true, but there are exceptions, depending on what generation the Ai-S came from. Later model Ai-S had improved multicoating (which is not to say that the earlier ones were bad).
Also some lenses, were improved optically when they moved to autofocus, or so it is claimed. For example, the 35 f/1.4 Nikkor Ai-S is a beast of a lens with a nine bladed aperture mechanism capable of really fine photographs. But wide open, it displays a lot of coma, which is either a great creative control or really irritating. Supposedly, the AF version of this lens reformulated the lens design and mate it work far more cleanly than the Ai-S. I don't know, because I paid $200 for mine b/c it needed some gentle aperture ring cleaning and reassembly, and I see no reason to replace it.
In my book, any of the following lenses - whether in Ai or Ai-S are absolutely top drawer performers and you cannot go wrong with any of them:
20mm f/2.8
24mm f/2.8
35mm f/2.8
35mm f/1.4 (prefer the Ai-S here for the 9 bladed aperture)
50mm f/1.4
85mm f/1.4
105mm f/2.5
180mm f.2.8
I own all of these other than the 35mm f/2.8 which I sold to buy the 35mm f/1.4. They all are terrific
shooters.
For the most part, I'd avoid the old Nikon zooms because they were ..... not good. Modern lens design came lightyears because of cheap computing to make the calculations feasible for complex zoom arrangements. But the Ai/Ai-S primes are just great.
(But I still shoot way more MF and LF cuz ... their ain't no substituted for square inches of negative.)