Quote: Nikon wins the battle thanks to the F-mount being older but Pentax wins the war because there is no phyical means for mounting a 1950's vintage rangefinder Nikkor-S on my D40x. Go Pentax!
while with the proper (albeit rare) adapter one can mount an m37 (asahiflex lens) and use it the same way you do an m42 Takumar. taking you all the way back to 1952. essentially allowing you to mount and use every SLR lens Asahi Optical has ever manufactured (not counting any lenses manufactured for other camera companies of course) like I said, 100% compatibility. nikon may have a longer history manufacturing lenses, as well as more prestige concerning its very long time high reputation for m39 rangefinder lenses, but none of it matters very much if you cant mount and use them.
I bet nikon would make a killing if it started to remanufacture AI conversion kits. I have several non-AI lenses for my F Photomic T that I wouldn't mind having AI converted.