Hygh Speed Sync with 580 EX II question

Started Aug 8, 2009 | Discussions thread
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Edgard
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Hygh Speed Sync with 580 EX II question
Aug 8, 2009

Hello,

I'm having problems understanding High Speed Sync with my Speedlite 580EXII. I though HSS was a feature aimed at outdoor shoots when you need to under expose the background and freezing motion. I don't understand why I get more flash output without HSS at slower shutter speeds.

Here are two examples with flash set to manual at full power.

Is not supposed to be the opposite and get more flash influence with HSS ?

Thanks
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