I had to post this...I love them on my Canons....
A couple of months ago I found an 85//1.8-H that had been used for video work (as I deduce from the attachment to the focusing ring that would allow a rod to stick out from it so it could be grasped and rotated by a 3rd hand, since removed, leaving the holes you see here below)
...other than that "surgery" the lens is in near mint condition and I expected to AI modify it for the day it would be born again and mated to a Nikon...Since one ring was already drilled, another cut, to the aperture ring, didn't seem too destructive...
I'd been patiently looking for AI mount lenses, should I get a Nikon to go with my Canons, and after modifying the 85 all but my 135/2.8 would be ready for 'the dark side'
...And then I came across this "K" version that had already been factory modified BY Nikon itself...and I had to get it!
...even though I had to get 2 other lenses (the 105/2.5 AI that took the shot of ring neck doves in the gallery forum, and a 55/2.8 Micro that took these photos) and an FE with it...all classics course, AND ALL MINT....but selling them (and my old "H") will pay for the "AI-K"
....and in my right mind I'd keep them all...but I can't afford to keep them and as I have a (less than excellent) 105/2.5 AIS I can let someone else enjoy them...oh well....



Note below the scraped mount...probably from the video camera it was on....
I must admit I do like the fact that Nikkors are so affordable....and sooooo good....
My Canon kit 450D/s90; Canon lenses 18-55 IS, 70-210/3.5-4.5....Nikon kit: D610; 28-105/3.5-4.5, 75-300/4.5-5.6 AF, 50/1.8D Nikkors, Tamron 80-210; MF Nikkors: 50/2K, 50/1.4 AI-S, 50/1.8 SeriesE, 60/2.8 Micro Nikkor (AF locked), 85mm/1.8K-AI, 105/2.5 AIS/P.C, 135/2.8K/Q.C, 180/2.8 ED, 200/4Q/AIS, 300/4.5H-AI, ++ Tamron 70-210/3.8-4, Vivitar/Kiron 28/2, ser.1 70-210/3.5, ser.1 28-90; Vivitar/Komine and Samyang 28/2.8; 35mm Nikon F/FM/FE2, Rebel 2K...HTC RE UWA camera