I'm not sure you're right... For effective second curtain synch, the flash needs to fire =immediately= before the shutter closes. A non-dedicated flash gets a signal at some point when the flash is fully open, but does not know exactly when the flash opened, or when it will close. For second-curtain synch, the flash either needs to know when the flash opened and the shutter speed, or needs to get a signal a millisecond or so before the curtain starts to close. Those are easily encoded so that only a dedicated flash "knows", it would seem.
Rick --- Godfrey DiGiorgi <[EMAIL PROTECTED]> wrote: > I've never understood why second curtain sync should > require a > dedicated flash unit. HSS I can understand ... it's > a very careful > dance of strobing the flash to precisely match the > shutter ... but > second curtain sync should simply trigger the flash > some milliseconds > prior to the second curtain closing to accommodate a > reasonably long > electronic flash duration. That's what the Sony R1 > and Panasonic L1 > do ... any flash unit can do second curtain sync > with them, dedicated > or not. > > Godfrey > > On Oct 13, 2007, at 11:17 AM, mike wilson wrote: > > > But digital flash control offers so many other > things, such as > > second curtain sync and, er, ....... > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link > directly above and follow the directions. > ____________________________________________________________________________________ Check out the hottest 2008 models today at Yahoo! Autos. http://autos.yahoo.com/new_cars.html -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
