The initial lens offering for the F camera in 1959 was a 5cm f2 S. I found my mint copy on an old FTN body I think it was that was also mint. They wanted like $70 I told old dude I was not a film guy and only interested in the lens. He said how much? I said $10. They go for around a buck fifty on the bay now. I should have bought the whole shooting match but at the time my film cameras were collecting dust. Foolish move on my part in retrospect. The Df collects more dust bunnies than any camera I have ever owned.