I use high speed synch mode on a regular bases. it works very well. If one were 
able to trigger the flash above synch speed in normal mode, the result would be 
a frame that is exposed unevenly. We used to be able to do that with some 
cameras. The result is predictable.
Paul
 -------------- Original message ----------------------
From: Godfrey DiGiorgi <[EMAIL PROTECTED]>
> On Jun 28, 2008, at 12:08 AM, Peter Loveday wrote:
> 
> > Does anyone know if any way to force the K20D to trigger the PC/ 
> > hotshoe at
> > shutter speeds about 1/180?
> >
> > I'm not talking about HSS (or indeed dedicated flash at all), and I
> > understand all the issues with flah sync; this is for a project  
> > where I
> > still want a trigger at any shutter speed.  Hotshoe would be ideal,  
> > but PC
> > sync would do.
> >
> > I've been over all the settings, and can't find anything, but I  
> > thought I
> > would ask here in case anyone knew any tricks.
> 
> The short answer is that there is no way to trigger a flash at  
> exposure times over the X sync speed unless you're using a dedicated  
> Pentax flash unit and HSS mode. I'm certain that Pentax considers  
> this a plus for most of their users.
> 
> Godfrey
> 
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