i have a 580ex and a sigma ef500 dg as my slave. i'm just wondering, what flash is more compatible as a slave, the ef500 dg or the 420ex? can i still use the 420ex as a slave without those pocket wizards coz with my sigma i can make them my slave as is (no other gadgets to be installed) i asked this question because a friend of mine is offering me a 420ex and some $$$ to to trade with my ef500dg. what do you guys think about this?
thanks in advance
cleng



