So I was at an airshow yesterday, and my lens would not focus for anything, so I attempted to compress it and focus again (go to 100mm) and it made a spring noise. I removed it and looked throught the rear element, there is a loose black ring inside. Looking from the front element you can tell its one of the stepped rings that is towards the front of the lens. I was so upset I left the airshow and went home. Off to canon Irvine I go



