[EMAIL PROTECTED] wrote: > 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. >
I would imagine that since the flash is very fast, probably faster than 1/10000 of a sec, that you could wait right up until the second curtain started to close. So if you did this, it would be closer to 1/500th of a sec before the second curtain closes, assuming the first and second take equal time to traverse the frame and the sync time is 1/250th. I suppose you could experiment with the shutter speed, i.e. try 1/125th and 1/250th + second curtain sync to see where the time actually is for the flash. > 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? > > > -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
