I hardly use my 50mm 1.4 because I have the 1.2. I just keep it as a backup. My 1 year old daughter managed to pick it up while it was out of my bag and it dropped on the hard wood floor. When I picked it up I discovered the rear element had popped out. I pushed it back in and it snapped into place. After a short test the lens seems to be focusing and working just fine. Does anyone know if that the rear element is just pressed into place or when it fell did it break something I don't know about? I hate to rely on it one day and find out it is broken but I also hate to send it in if it is fine. Anyone know?