As you know there are 2 versions of this lens, AI & AIS. As per Bjorn Rorslett optically there are no major differences despite the differences in the aperture blades (7 vs 9). For usage I suspect it would be the AIS version because of the newer coatings etc. I have owned 3 AIS versions and they have all been perfect. I have never owned an AI version as yet.
I presumed the more collectible version would be the AI version as it is rarer than the AIS version (2000 vs 9000 as per Roland Vink). However 2 of my friendly Nikon experts suggested it would be the AIS version. Just wanted to check which version is more collectible? Many thanks in advance!!!

