Quote Originally Posted by John_Nikon_F View Post
Not true. The K version is the black barrel lens that looks like an AI/AIS lens. The diamond pattern rubber focusing ring was used on zooms and certain primes, like the 55/3.5 Micro-Nikkor-P/PC, and the 180/2.8. Both of those lenses were chrome barrel, unlike the K version.

A Micro-Nikkor-PC: http://www.destoutz.ch/lens_55mm_f3.5_734997.html

A 55/3.5 Micro-Nikkor K version: http://www.destoutz.ch/lens_55mm_f3.5_910139.html

The compensating diaphragm 55/3.5's have a metal focusing ring usually marked with a distance scale in either meters or feet. Serial numbers are much lower, too, being below 300,000. As the helicoid is extended, the diaphragm slowly opens up.

It's a great little lens. Slow for a normal lens, but it does the job quite well. Was what John Shaw used back in the 1970's through the early-mid '90s. Who knows, he may still have it today, even though I doubt he does much shooting with it, since he probably has current generation Nikkors that do the job.

Mine is this version : http://www.destoutz.ch/lens_55mm_f3.5_600033.html and the # on mine is 691621. I have read and been told that these are "K" lenses, the distinguishing characteristic being the rubber diamond texture focussing ring and the chrome barrel. Oh well.