Multi Stroboscopic?

Could someone please help me with Multi Stroboscopic?

I'd like to have two flashes in one exposure. I make the setting in the flash and test fire with the button on the back of my 580EXII, no problem it fires twice.

Next I try firing from my 5D, and the flash only fires once?

What's up?

Oh, i should add, here are my proposed settings.

I'd like to set my 5D at approx 200 @ 28.-5.6f to kill ambient light.

My 580EXII at approx 1/4 - 1/16

And to complicate matters I'm using the new Pocket Wizards...

Too much?

So you want multiple flashes in stroboscopic mode firing at the same time? Stroboscopic is where it flashes at (eg) five times a second for three seconds, or whatever you choose.

Have you read the manual to see if this is possible? My guess is it's not, because it's not really all that useful.

How about telling us what you're trying to achieve?

After setting the flash you have to make sure the camera shutter speed is long enough to allow the completion of the flash sequence.

What are you trying to photography with the double flashes?

The shutter speed you are using is too fast to use the flash in Multi mode even at the highest frequency available. The maximum frequency you can set for Multi mode is 199 Hz. To fire two flashes at 199 Hz, you would need a shutter speed of around 0.01 second or 1/100 second. Unless the object or subject you are photographing is moving really fast, you probably won't see the effect of the double flash going off at 199 Hz.

Re the PW MiniTT1 and the FlexTT5, Multi mode is not yet supported by those units.

I'm trying to achieve a double exposure of a person in motion in a dimmly lit room while killing the ambient light, using a single 580EXII. Doesn't sound like it should be hard.

Sounds like I'll have to use a PC cord (or the ST-E2?) to trigger the 580EXII, Titus you're right the new mini PW's don't have that feature apparently. It's the MultiMax's that have this feature.

Anyone know of a tutorial anywhere?

Here's how you determine the parameters you need to set on the flash and the shutter speed on the camera.

First, determine how far apart you want the flashes to be. Say, for example, that you want the flashes to fire half a second apart from each other. That's a frequency of 2 flashes per second or 2 Hz.

Next, determine how many flashes you want to fire. You said you only want two flashes.

You'll also need to set the power level on the flash for each flash.

Set the frequency, the number of flashes and the power level on the flash.

To determine the shutter speed (in seconds) you need, divide the number of flashes by the frequency (n Hz). In the example above, that'll be 2 flashes / 2 Hz = 1. So, the shutter speed will need to be set to one second.

Hi...Almost..

PacAce wrote in post #9757066
Here's how you determine the parameters you need to set on the flash and the shutter speed on the camera.

First, determine how far apart you want the flashes to be. Say, for example, that you want the flashes to fire half a second apart from each other. That's a frequency of 2 flashes per second or 2 Hz. Exactly right

Next, determine how many flashes you want to fire. You said you only want two flashes. One 580EXII

You'll also need to set the power level on the flash for each flash. 1/16

Set the frequency, the number of flashes and the power level on the flash.

To determine the shutter speed (in seconds) you need, divide the number of flashes by the frequency (n Hz). In the example above, that'll be 2 flashes / 2 Hz = 1. So, the shutter speed will need to be set to one second.

Did that, but didnt fire?

yes yousay you have done those but you say you are using a 1/200 shutter speed
which is way too fast
when doing stroboscopic you dont kill the ambient you make sure there isnt any
you have to do it in a dark situation

30Der wrote in post #9759469
=30D'er;9759469]Hi...A​lmost..

Did that, but didnt fire?

By "number of flashes" I did not mean the number of flash units you are using. I meant the number of times the flash unit goes off (lights up). If I understood you correctly, you said you wanted that to be two flashes of light.

Did you say the flash did not fire? Not even once?

And what did you set the shutter speed to?

If you were following my example, the camera shutter speed should have been set to 1". And on the flash LCD screen, from left to right, you should see "1/16 2 2Hz" displayed.

And, of course, the flash should be sitting in the hotshoe unless it's connected via an off-shoe cord.

Titus213 wrote in post #9756471
After setting the flash you have to make sure the camera shutter speed is long enough to allow the completion of the flash sequence.

As I mentioned earlier....