The 180mm f2.8 APO that I have been using on my D800 may be the best tele for distant photography where it is just amazingly good.
It is still excellent but IMHO a bit less outstanding at closer range.
The focus on infinity performance over close range is apparently even stronger on earlier iterations of this lens.
Cheers,
Bernard
Not sure what you mean. There has been only one version of the 180mm APO-Elmarit-R. There were two non-APO versions, first one from 1967 and second one from 1980.
All in all, there have been six 180mm lenses for the Leica R system, listed below, along with the approximate date they were introduced:
180mm Elmarit-R (1967) f/2.8
180mm APO-Telyt-R (1975) f/3.4
180mm Elmar-R (1977) f/4
180mm Elmarit-R II (1980) f/2.8180mm APO-Summicron-R (1994) f/2
180mm APO-Elmarit-R (1997) f/2.8
I have owned examples of the first four at one time or another and can give an opinion on their quality.
I would be surprised if the 180mm APO-Elmarit-R is less good close-up. I understand it was internal focus (the barrel does not elongate) which is usually an indication that the lens has been designed to have very good close-up performance.