I just got a Canon 580exII and I am looking toi buy a couple more flashes to work with it in auto mode. My options are:
1: Canon 430ex Flash w/GN 140@100'
2: Sigma 500DG Super w/GN 150@100'
3: Canon 550Ex w/GN 180@100'
Cost is a factor if I go with the Sigma I may be able to get two if I can find a second at a good price or I can get the Sigma and a 430ex basically for the same price as a 550 or 580 flash.
These are going to be used as slaves only since I have the 580exII. I have three Vivitar 285's for use as manual flashes right now and looking to have the option of using wireless ttl is the reason for buying the new flashes. I normally power my flashes with Quantum QB1(+)'s but I may go to the Turbo for the 580exII real soon.
What are the pros and cons of the three flashes listed above?
