This is one of the hidden secrets of the classic Nikkor line. People often confuse it with the Series-E but this lens is much better. It is very compact and resistant to flare because of its recessed front element but the important thing is that stopped down it is probably the sharpest Nikkor available. This is the rare AI-S versionThis lens has light fungus inside. I can only see it when sighting with a flash light and I do not think that it will affect image quality. The focus feels a little dry but is not hard to move. Cosmetically the lens is beautiful. I have set a low price so if you can put up with a little fungus you can get a deal.