I recently received the 580ex II speedlite for my Canon 20D. When I started using it, I observed that the flash was set on M Zoom (manual) and displayed constantly a 14mm focal whatever the lens I used (28 and 50mm primes). Nevertheless, the Auto Zoom function appeared briefly yersteday with the right focal length after having turned on my speedlite first and then the camera. I tought it was the normal procedure. But since yersteday, the flash is displaying M function, no way to change it! Please Help ! I read the user guide and I am wondering what else to try before sending it back to the reseller. Thanks for your help and answers.