John White of aiconversions.com has been doing the AI upgrades for the last decade or 2. I had my 60's Nikon F era lens converted, charge was /~$35, workmanship was excellent. My lenses were the venerable classics--35-50-55-85--their performance on my N80,D100 and D300 was and still is superb. Get your 50mm 1.4 (same as mine) converted and enjoy a truly fine lens once again. The 55mm Micro will still sizzle your sensor, on my N80 with Microfile (Hi Contrast copy) and Microdol 1:3 resolution was limited to my focusing ability and diffraction effects. On the D100 resolution was limited by the sensor.
Excellent overview. Many thanks irv weiner