On Fri, May 22, 2009 at 01:26:54PM -0700, Joseph McAllister wrote: > > I was waiting for someone to argue my "10,000" mph was incorrect for for > focal plane shutter velocity. It probably is.
Well, let's look at that. Basically, the flash sync time can be taken as the time it takes for the shutter to move from one edge of the frame to the other. For an APS-C camera with a 1/180s flash sync that's 16mm in 1/180 of a second, or 2880mm/second, which is around 6.44 mph. So, yep - that 10,000 figure does sound a little high. (Not that you need the detailed arithmetic to know that; there's no sonic boom, so the shutter must be moving at less than 760 mph :-) -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
