Report "I have a Sigma 500 DG Super for Canon I just got used on EBAY and I have a problem with my it on my new Canon t1i with 18-55 lens, when I focus on a subject with the flash directly pointed at it, the flash continuously zooms and is unable to zoom to the correct zoom range to match the lens. I have the flash on ETTL and the camera on P, TV, AV, or Full Auto. I have not been able to find anyone else complaining about this issue on google searches. Also when I shoot close ranges of my son, 2-3ft away, with the flash pointed up, the flash overexposes so the whole picture is bleeding white. Like 10 stops over exposed, (if that's possible!). I also have a canon speedlite 380ex and I have had it for months without a single over exposure or zooming problem. Are my settings wrong or is there something wrong with the flash? Thanks, Emmanuel"