Originally posted by heasley This seems very unreasonable to me. Any advice?
Certainly if I were the seller, I would have been much more forthcoming with that information in the description of the lens. The fact that the seller is hiding behind the fact that she didn't technically provide inaccurate information seems somewhat childish to me. It also suggests that either she knew about the fungus or at the very least isn't denying that there is an issue.
That said, in the second picture it looks like you can see the fungus on the front element (at least I assume that's what I'm seeing in the picture). Whether or not you noticed and/or should have asked more questions before bidding is another issue altogether.
Unfortunately, I'm not sure I have any good advice to offer, nor do I know specifically what your options are given the situation. I guess at the very least you could contact the seller again and politely disagree with her assessment about where the fault lies, although there is certainly no guarantee a second message will be any more productive than the first. If (when) that doesn't work, the next step would be to contact eBay through the resolution center.