Hi All I have a Canon 17 – 85mm IS USM lens that I bought in September 2006. I have recently noticed that if the camera / lens is tilted down i.e. the front of the lens is pointing to the ground; it slowly slides, changing focal length. I believe this may be known as ‘zoom creep’? Is this normal and should it be happening on an 8 month old lens? Do you think the store would be willing to consider a replacement or is this to be expected and thought of as being ‘normal’?