Thanks Bill, I knew there was something more involved here but I couldn't verbalize it with the limited mental resources I allotted for the task.
CW ----- Original Message ----- From: "William Robb" <[EMAIL PROTECTED]> To: "Pentax-Discuss Mail List" <[email protected]> Sent: Tuesday, September 25, 2007 5:42 PM Subject: Re: Thinking of AF280T flash > > ----- Original Message ----- > From: "Axel Belinfante" Subject: Re: Thinking of AF280T flash > > >> >> I guess the bottom line is that "dedicated" by itself is >> an empty phrase. >> "dedicated" is not an absolute notion, but a relative one. >> it is relative to a (family) of camera body(s). >> > > "Dedicated" is an absolute term, and means that the flash will communicate > with the camera body to set the shutter speed and aperture (in the case of > programmed exposure cameras). > This is by no means an empty phrase, though you probably would have needed > to be around the camera industry 25 or so years ago to know what the > original meaning was. > > A "manual" flash is a single output unit which only communicates output > triggering with the camera. > An "auto" flash is a variable output unit which only communicates output > triggering with the camera. > A "dedicated" flash communicates shutter speed and aperture setting > information with the camera, and causes the camera to set the shutter > speed > to X-sync and sets the aperture to match the flash output range. > A "TTL" flash communicates flash output with the camera for the purpose of > regulating output. > A "dedicated TTL" flash communicates shutter speed and aperture setting > information with the camera to set the shutter speed to X-sync and sets > the > aperture to match the flash output range and communicates flash output > with > the camera for the purpose of regulating output. > Recently, as cameras have thunderbirded, and morphed into lens based > computer systems, the method of communication had changed, but the > principles haven't changed all that much. > > Now you know. > > William Robb > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.488 / Virus Database: 269.13.30/1030 - Release Date: > 9/25/2007 8:02 AM > > -- 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.
