My experience with ebay is that in the UK, these days, the buyer has rights and if he can prove that the item isn't as described in the listings then he is entitled to a full refund upon return of the purchased item. Having said that, I am not certain what happens if he has already given positive feedback. (That is the reason why I wait before I give feedback on a purchase on ebay). And I believe if the purchase is made with PAYPAL then the buyers rights are even more strictly enforced.
Personally I have found, unlike the early days with ebay, that the buyers rights are quite heavily protected on ebay in the UK now.
I will be interested to know how you get on. Good luck. I know very little about cameras.....is it possible for the buyer to just clean the lens or is that a silly question?
I believe you can reach a compromise through negotiation and / or the buyer has the option to have the matter settled by ebay / PAYPAL.
The buyer has 45 days from the payment date in which to register a claim, as far as I know.
