On Fri, Apr 24, 2015 at 01:33:44PM -0600, steve harley wrote: > On 2015-04-24 6:25 , Darren Addy wrote: > >It is possible, assuming that the flash would only use 25% of full > >manual power on the 4 consecutive shots. > > i would think each of the 4 exposures would require the nominal amount of > flash, as you'd need a good "histogram" on each of them to get the best > result after merging
Each of the four exposures would get the same amount of flash (up to 25% of the total power the flash has available). (That, of course, reduces the effective guide number of the flash). The camera will tell the flash unit how much power it should use. That's what is done nowadays when using high speed sync - multiple firings of the flash as the open slit in the shutter moves across the sensor. I'm always impressed that the shutter mechanism is precise enough that there are no visible artifacts of this - that means the timing of the flash has to be precise to the microsecond, and the shutter curtains have to remain parallel, with a constant separation, to within the dimension of a pixel. -- 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.
