Interesting question! I got Nikkor-S 1.4/58mm and did Ai modification. First I tested it on digital body (D7000). It's total dog lens. The worst lenses I have ever seen. I can't believe that Nikon made name with this lens in 1960. The lens I own is in very nice shape with no signs of impact or modification (other than AId). It was so bad that I lost all interest to ever try it on film body. On other hand, Nikkor SC 1.4/50 and Ais 1.4/50 are way better lenses.