High speed sync

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Joined
25 Oct 2004
Posts
510
Ok, so off on holiday soon. Currently using a 550d with 15-85mm lens. Even with the lens hood off I get the horrible arc of shadow.
So, I'm looking at a dedicated flash but not wanting to spend a huge amount. Now, I've been trying to figure this hss thing out and decide whether I'm going to need it or not as generally it only comes on the more expensive flash units
Is it only useful for flash fill outdoors. Would you enable it for fast shutter speeds indoors?
If anyone could shed any light I'd really appreciate it.......no pun intended
 
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