Sigma EF-530 DG Super EO-ETTL II Electronic Flash for Canon EOSI bought the 530 Super to replace my 500 ST.It's definitely faster and quieter than the ST.So what's the main difference you ask between the 530 and 500 SUPER.I would say that the 530 adds more power to the flash.The ETTL metering seem's to right on the money.If you were to compare this flash with Canon's 430EX, I would rather get this one.Same performance with added wireless MASTER transmitter.

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