fungus

Recently discovered fungus inside my lenses. I don’t even know where to begin. Can anyone recommend how to treat it? Where to take it to get fixed? Prices? Thank you in advance

Bought this lens on eBay. I think the winning bid would be extremely good if it didn't have these issues, and pictures don't seem to be affected. It appears to be fungus growth on the rear elements, and maybe fungus/separation on elements to the front.

Hello, so I just bought a Leica CL from *that* auction site, and as I was inspecting it upon arrival I came across a small mark in the viewfinder. Apologies for the awful picture but photographing viewfinders is such a pain! The mark in question is a sort of X-like thin line between the...

It's growing on the stump of a tree that we cut down about thirty years ago. Any help would be much appreciated...