The 55/1.2 started as the Nikkor-S 55mm 1:1.2 at the end of 1967. It went through a few changes including the addition of multicoating in 1972, a modern barrel style in 1974 and upgrade to AI in 1977. The optics also had some minor tweaks to improve performance over that time. It was replaced by the AI 50/1.2 in 1978, and by the much more expensive Noct 58/1.2 around the same time.Interesting. Never knew they made a 55 1.2. I knew of the 50 1.2 and 58 1.2. just read up on it. Now I want one.
Technically the 50/1.2 (AI and AIS) is a better lens - slightly sharper, better contrast and better (but not great) bokeh wide open. The AIS 50/1.2 also has a nicer 9-blade aperture (not rounded though) compared to 7 blades for the older models. But I still like the 55, it has a charm of its own. I also like the slightly longer focal length.I just sold my 50 1.2 AIS, i miss it already. How does it compare to the 55?