I just bought a 550ex to go with my 300D and as far as i can tell the flash is zooming with the actual focal length of the lens not the effective focal length. has anyone encountered this before ? is there anything that can be done to overcome this, one of the reasons i bought a 550ex rather than my sunpak 4500 was it was suppossed to be integrated with the digital. i might not throw out the sunpak after all.