OK Pascale! Checked out the ad and ummmm I must say... The first thing I notice in the ad itself is the fact that they are showing a picture of this lens on an Olympus Camedia! Kind of makes me wonder if the lenses between the Olympus and the Sony are interchangeable or are you in possession of an Olympus lens. Checked out your seller too! He is a power seller which means he gets a ton of feedback! 2,433 positive feedbacks in six months isn't anything to sneeze at so he must be doing something right! Well in that same six months he has 26 neutral feedbacks, 6 negatives and 7 mutual withdrawls. While the problem may be as LP and Randy suggest, I think it has more to do with being the wrong lens... read on. Go in and read his feedback from the dates April 23rd, April 20th, March 12th and February 14th. (I am sure there are more if you look closely, I just kind of skimmed through part of his feedback record!) You will note that on the dates I noted he has sent out the wrong lenses for various cameras. Your seller seems basically honest and if you email him you may be able to resolve your issue. If he doesn't respond to the email, he definately seems to respond to negative feedback. Let us know what happens! Brenda :)