I have had the 430 EX for about a year and a half, and wanted the 580 EX II to fire my 430 as a slave flash. The build quality, as expected, is excellent. The flash has a guide number of 58 meter, which theoretically will give the right exposure on a gray card 14.5 m away (about 48 feet)on a moonless night at f4 ISO 100. The extra flash power is useful for bounce, reflected, softened, and otherwise modified flash. The eTTL gets the right exposure even when bouncing flash, although you may want to set flash exposure comp (FEC) in some cases. FEC is done by a button and a dial (with clicks you can feel), so you can do it in the dark.
The weight of the flash makes me wonder if shooting in portrait mode would put undue stress on the flash base or the hotshoe. I have gotten a stroboframe flip bracket and the Canon flash cable (expensive!) to shoot in portrait mode.Get more detail about Canon Speedlite 580EX II Flash for Canon EOS Digital SLR Cameras.
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