Jun 3, 2005, 07:59
Is it that the 550EX has a max. guide number of 55 while the 420EX has a max. guide number of 42.
So the 550EX is more powerful, but also contains other features.
I use a Sigma EF-500. Which is supposed to have a few similar features to the 550EX
So the 550EX is more powerful, but also contains other features.
I use a Sigma EF-500. Which is supposed to have a few similar features to the 550EX
gear: camera and stuff
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