The first flash is the pre-flash used in P-TTL for integrated flash/ 
ambient TTL metering purposes before the mirror swings up.

The second flash is actual flash made for the exposure, approx 1/250  
second before the second curtain begins to close.

Godfrey

On Dec 24, 2006, at 8:39 AM, Walter Hamler wrote:

> I was trying out the slow sync(second curtain) flash last evening  
> with the
> K10D. I don't think it is working properly. When the shutter speed  
> is around
> 1 sec so you can see what is going on, the flash discharged when  
> the shutter
> is first tripped, then is discharged a second time with the trailing
> curtain. I thought there should only be one discharge, at the second
> curtain. Am I missing something?


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