I've only had my baby(70-200 f/2.8) for about 3 months now and went to get it out of it's cozy home in my camera backpack.. And the lens is not attached to the camera anymore!! The coupler is, but the rest of it is laying there!! I've noticed before that it had some play around the coupler but never worried to much about it.. So now I'm wondering what the heck I'm suppose to do.. I doubt sigma will warranty it. But there is not a scratch on it and I didn't drop it or anything! It's was always stored in my camera backpack. Should I send it to sigma and see what they do?? If you look at the coupler end there are only 3 tiny screws that support the entire weight of the rest of the lens. And to boot the thread into plastic! No wonder they failed!