On Dec 24, 2006, at 7:23 PM, Gonz wrote: > 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.
If the system is very very sophisticated and can incorporate the timings for a flash quench dynamically, yes, the flash could fire at as little as the minimum quench time it is capable of. But most second curtain timings are set for about 1/250 second prior to second curtain release because that is the average usual flash illumination time for a studio electronic flash at full output. Of course, this speculation and trivia is irrelevant to practical use of second curtain sync or the initial question. Godfrey -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
