I am currently looking at bidding on a lens on ebay. I would really like to buy this lens, but there are a few things that make me hesitant. First, the seller has no feedback whatsoever. I usually only buy from people with a ton of positive feedback, but I've never had a situation where I wanted to buy from someone with no feedback. Second, the seller lists almost no information about the lens. He lists the focal length, the fact that it's a series 1, and that's about it. I know it is the third version of this lens, so I can deduce that it's aperture and the filter thread size, but I want to know if I should be hesitant because the owner appears to know so little about the lens. The biggest thing that makes me really want to believe this guy is the fact that he had an earlier posting for a camera with two other lenses that go with this lens. It has occured to me that he might have just found his old camera and had no more use for it, so decided to make an account on ebay and sell everything. What is the likelihood of this happening? Thanks in advance for any advice you can offer!