There are a couple of low-buck solutions. One is a dumb speedlight with an IR filter over it so it doesn't affect the image.
The other is a bunch of $10 yongnuo triggers. I've had bad luck with their "high end" speedlights, but their cheap triggers are brilliant. On April 22, 2018 10:46:31 AM PDT, Bruce Walker <[email protected]> wrote: >Mark, what you experienced is one of the reasons I don't recommend >folks >try that popup flash triggering hack. The other of course is the light >pollution from the popup flash getting into the shot and flattening the >contrast. > >But you have at least two possible issues with each student's camera: >the >x-TTL pre-flash, and the "red eye reduction" pre-flash. Either or both >of >these might be enabled in any given camera. > >The xTTL preflash is usually enabled even if manual exposure is in use >because of the possibility for remote flash control. I used to use that >feature with the K20D and the K-3 as a poor man's remote trigger. No >danger >of the popup flash appearing in the shot because it doesn't fire when >the >shutter is open. > >But it only works with flashes that support a pre-flash -- manufacturer >dependent timing -- and some newer Chinese strobes that can be set to >ignore 1-n pre-flashes. > > >BTW, most PCB strobes come with a really long old-school PC-Sync cable. >That might have helped with any of the students cameras that have a >sync >socket. > >-- >-bmw >-- >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. -- Sent from my Android device with K-9 Mail. Please excuse my brevity. -- 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.
