what am i paying for besides pure power and ability to use the 580 as a slave? and what are any other differences between these two
:thumbup:580 is more powerful.
580 Has power reduction in 1/3 stops down to 1/128th power. 430 is 1/3 stops down to 1/64th power.
580 has an off camera terminal,(PC connector). 430 does not.