This lens was never upgraded to AI standard although conversion kits were available for a few years after it was discontinued. Nikon made this lens from 1964 until 1975 and then inexplicably replaced it with a lens more-or-less universally agreed to be its inferior.

The construction quality, fit and finish of this lens is exquisite. Nothing like this is made now and even the current lens offerings will mostly be gone before this lens breaks.

It was a lens like this that David Hemmings used to photograph Veruschka in the studio scenes of the 1966 film ‘Blow-Up’. You can appreciate therefore that owning a lens like this will enhance your style credentials as well as instantly make you a better photographer.