Hi Gang............ A while back I was asking about the Canon 580 EXII flash............. Now the Sigma EF 500DG Super Flash is about half the prince.......... Anybody have any experience with the Sigma? I use mostly Studio Flash, but on occasion I need a flash with more features than the Canon 420 EX that I have now. Ya know....... What I need is something like the Vivitar 283, that will talk with my Canon 10d and 30d. Russ R.E. Baker Photography rebphoto@xxxxxxxxxxx www.rebphoto.smugmug.com Feed a Cat... Starve a Fever........