Quote Originally Posted by rolleiman View Post
I have two older "S" Nikon lenses, as well as more recent AI ones. My own conclusions; I prefer the older "S" lenses for black & white, they have an indefinable quality about them. the AI lenses give better colour results generally, doubtless to do with the extra coating.
The op's lens, a Nikkor-s is a 7 element lens. That is what the "S" means, s = sept = seven. The letter after "Nikkor" designates the number of elements, using Greek and Latin. H = hex = six, P = penta = five, and so on.

Most, but far from all lenses with the letter code for # of elements will be single coated. Perhaps that is your "indefinable quality".