I've owned appx 30 lenses in my life from 35mm, Med format, LF, toenlarging lenses. The vast majority purchased new: Nikkors, Bronica, Mamiya, Minolta, Sigma, Tokina, Schneider, and Rodenstock. I have seen fungus in 4 of them - all Nikkors -3 LF Nikkors (including a brand new 75mm I recently returned to the retailer, whence I picked up the 150 apo sironar instaed), and 1 Nikkor 50mm enlarging lens with fungus. The Nikkors with fungus were sharp as you-know-what.
I know fungus can grow in any lens, blah blah. But personally I'm not jumping to spend my hard-earned money on any more Nikkor LF glass.
Your Nikkor karma may very. I hope it is good.
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