I've been trolling craigslist the last few days, thinking I might find something interesting (I'm looking for a longer legacy lens). After looking over the last week's worth of ads, it looks like there are mainly two types of sellers: (a) people who are asking WAY too much for their stuff; and (b) people who have NO idea what they're selling at all, so they can't even describe it. Sample listings: "300mm lens" "Canon with 50mm lens" "Old Nikon film camera with 3 lenses!" So, my question is: have any of you bought lenses/camera from craigslist and, if so, do you have any advice? How do I separate out the wheat from the chaff?