Hi: I purchased an old MF Nikkor lens to go with my F2A: it's a 50mm f/1.4, with the markings on the front of the lens that read, "Nikkor-S.C. Auto", with manufacturing number 1414733. It's a non-AI lens that was converted to AI at a Nikon factory, an operation which I do not believe they do anymore. Anyways, I wanted to know the qualities of this lens, if any of you have had any prior experience with this lens, any information about the S.C. Auto series would be appreciated. Also, I am looking into purchasing a telephoto zoom lens, looking in the 80-200mm range. I looked at the old MF Nikkor 80-200 f/4, and found that in every case the zoom mechanism was extremely loose and would unintentionally slide down the barrel of the lens with the slightest provocation. Also for about the same price (canadian) I have seen the Tokina 80-200mm f/2.8, which felt like it was just built a whole lot better then the Nikkor, but optically, I don't know how these two lenses perform. Can anyone enlighten me? thanks joshua