Originally posted by sugus I'm pretty sure that's what it is! But I doubt you can catch it from my lens.
I'll see if I can get a photo of it when I have a chance. Images from that lens still look fine as far as I can see.
I live in such a dry climate I'm thinking it must have been there when I bought it but I didn't notice it at the time.
Since it was the cheapest MF lens I own I'm not too concerned. I have heard people worry about fungus spreading from lens to lens but as far as I understand it, the spores are already everywhere. You just need to keep them dry and it won't grow. Unless this is some new drought resistant fungus...