PC cord & hotshoe at same time

Hi all,
might be a silly question, but how does the timing of the PC cord trigger relate to the firing of a 580exn flash set up in the hotshoe? (or triggered via ST-E2 for that matter)
I suspect it just fires away within the shutter-sync opening but couldn't find anything specific doing a search.

I don't understand the question.

Basically he is asking which is faster, attaching the flash via hot shoe or via a pc-cord.

In terms of trigger the flash.

Then the question arises - in what photographic situation will the timing of the two triggers be critical? I suspect both means will be in the microseconds, perhaps, even in the nanoseconds area. A good question to pose to a manufacturer of camera/flash technology.

I think he wants to know if he will get light for the exposure from both units.....and I think he knows the answer already.

tim wrote in post #6729160
I don't understand the question.

probably sounds more complicated than I need it to be.
What I'm asking is how well does PC cord triggered flash work with hotshoe and/or ST-E2 triggered flash, do they play well together or is there timing issues? I was thinking along the lines of the PC cord trigger being an electronicly different beast than the hotshoe and wondered if, the actual flash timings differ (even if both fire somewhere within the confines of the shutter sync)

I can't see it being an issue (perhaps at the very extreme limit on a 1d classic with its 1/500th sync) but I use a wireless trigger attached via a PC sync cord while having either a ST-E2 or speedlite on the hotshoe without issues at 30D sync of 1/250th.

The wireless will certainly induce a longer delay than a sync cord, so it should be well within the shutter opening timeframe.

I quite often have a 580EX on the hotshoe, with a skyport transmitter through the PC port. They fire simultaneously when I hit the go button. The shutter button. Whatever it's called. My skyports usually manage 1/250th.

thanks all, will cobble up a lead & see how it goes. My preference to keep things wireless is currently overridden by budgetry constraints...

joeseph wrote in post #6730440
thanks all, will cobble up a lead & see how it goes. My preference to keep things wireless is currently overridden by budgetry constraints...

You can borrow my skyports Duncan, they are currantly doing nothing (as per the last 3 weeks and as far into the foreseable future as I can see)

Mark Vuleta wrote in post #6730454
You can borrow my skyports Duncan, they are currantly doing nothing (as per the last 3 weeks and as far into the foreseable future as I can see)

that's very kind thanks Mark, will see how things go, I have yet to get my other flash back from someone I lent it to - not sure when it'll come back...

joeseph wrote in post #6730247
probably sounds more complicated than I need it to be.
What I'm asking is how well does PC cord triggered flash work with hotshoe and/or ST-E2 triggered flash, do they play well together or is there timing issues? I was thinking along the lines of the PC cord trigger being an electronicly different beast than the hotshoe and wondered if, the actual flash timings differ (even if both fire somewhere within the confines of the shutter sync)

You should not have any issues mounting an EX flash or the ST-E2 transmitter on the hotshoe and having a strobed connected to the PC port via a sync cable. The main flashes of both will fire at the same time immediately after the shutters open unless 2nd curtain sync is set, in which case, the EX flash in the hotshoe will fire later than the PC connected flash assuming a slower shutter speed is used.