I've used this feature on flash units very occasionally, mostly because in most cases I find it easier to manual focus in dim light rather than rely on *any* autofocus system.
Trigger voltage is the static voltage across the sync terminals of the flash unit. As such, it doesn't matter if the flash will fire or not, what matters is how much voltage the camera's flash synchronization circuit can handle without damage. On Tue, Aug 2, 2011 at 8:48 AM, Darren Addy <[email protected]> wrote: > I apologize for not having the model number in front of me as I begin > this thread, but in a Pentax film kit I purchased a while back I found > an older Pentax flash that (research revealed) could be set to an AF > Assist mode ONLY. That basically means that it would project an IR > beam that the camera could then make use of to (presumably) AF in > lower light where it might normally hunt back and forth. > > I figured it would be worth keeping, if only for that feature, as when > I looked at it's going price on that infernal auction site it seemed > to bring very little. > > I'm wondering if anyone has ever used a flash in this manner (for AF > Assist only, to do lower-light, available-light shots without flash)? > > I suppose my next question is whether trigger voltage is even relevant > when using a flash only in this mode. I'll have to see if I can find > the flash when I get home tonight so I can illuminate this thread a > bit more. (If you recall the Pentax model or models with this feature, > feel free to chime in). > > Darren Addy > Kearney, Nebraska > > -- > 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. > -- Godfrey godfreydigiorgi.posterous.com -- 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.
