Fungus?

[alyu]

Yesterday I found a small collection of spots on the edge inside my Nikon 70-210 f/4 Series E lens. It might be fungus, or dust, or something else. (Or I'm just being paranoid). Any ideas as to what it is? I don't really know what fungus could look like.

(The pictures make it seem much larger than it actually is.)

 

[brucemuir]

Hard to say from that picture but it looks too concentrated to be dust and may be the beginnings of an infestation..
Tons of info via google.

http://throughavintagelens.com/2010/06/lens-fungus/

I should mention all the fungus I've seen has been the spider web looking type.
This type is easy to identify as fungus.

Yours looks a bit harder to tell at this point.