i am after a flash for my 40d aswell but what would the benifits of the 580 be over the 430??
and do i go for a mk1 or mk2 of either model??
sorry to hijack your thread a little but i am sure any answers will be helpful to you aswell..
is your 430 a mk1 or 2??A little extra power and probably a faster recycle time but I've never needed it. My 430EX keeps up with my 40D. I'd only get the 580EX if I wanted to run my 430EX as a wireless slave.
is your 430 a mk1 or 2??