Luiz, You are correct as to how the shutter curtains work, in hindsight my math is in fact off here and should be ignored. Shutter blade speed is higher than what I computed.
-Adam On Mon, May 25, 2009 at 10:12 AM, Luiz Felipe <[email protected]> wrote: > Sorry to ask... but what does the 1/250th of a second with the speed at wich > the shutter curtains open and close? I always understood the curtains moved > at the same speed, and the actual exposure time was controlled by the > difference in the their release - from a very short difference to a few > seconds, where the x-sync was first the moment the entire film was exposed. > > Moving the max speed and x-sync upwards required faster shutter blades, but > there was always the need for exposing the entire film to a conventional > x-sync, and the exposure still is dosed by the difference in the release of > the shutter blades, not their speed of travel, AFAIK. > > LF > > Adam Maas escreveu: >> >> Well, since you asked, shutter blade velocity is 6m/s at 1/250th. That >> works out to about 13.5mph ;-) >> >> -Adam >> >> On Fri, May 22, 2009 at 4:26 PM, Joseph McAllister <[email protected]> >> wrote: >>> >>> I was waiting for someone to argue my "10,000" mph was incorrect for for >>> focal plane shutter velocity. It probably is. >>> >> > > -- > Luiz Felipe > luiz.felipe at techmit.com.br > http://techmit.com.br/luizfelipe/ > > -- > 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. > -- M. Adam Maas http://www.mawz.ca Explorations of the City Around Us. -- 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.
