> Would someone explain something to me?  I do not understand 
> why I should have to put my flash (550 EX) into high speed sync 
> mode manually.   Why can't it just automatically sync to any 
> shutter speed I set,  since it has the capability to anyway?   
> Why should I have to stop and push buttons on
> the flash unit?   Just doesn't seem logical to me.

Hi Steve,

As Darrell said, you don't always want to use high-speed sync,
because flash output decreases. But this should not be a
problem, because the 550EX remembers its settings, so
you can set it to high-speed sync once and for all. This way
it will synchronize normally under your X-sync speed and will
automatically enter FP mode if you go above the X-sync speed.

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