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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 25 Aug 2011 (Thursday) 13:45
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Slaves: Mixing YN468 and 580ex

 
delhi
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Aug 25, 2011 13:45 |  #1

OK first off I know the Yongnuo yn468 is an optical slave unit while the 580ex is via light pulses.

So here I am with a 7D that has flash master control. I am wondering if I set the 7d flash to Master Wireless that will also fire off flash it should technically work right?

7D master: ETTL II
YN468: S2 (slave. Avoid pre-flash pulses and fire upon master's flash)
580ex: Slave. Group A.

In theory, it should work right? But in practice I only managed to get the 580ex to go off. YN468 didn't despite the 7d's flash fired as well.

Even if I switched from ETTL II to Manual, the yn468 didn't respond. It did only when I disable Wireless Flash altogether.

Thoughts?


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Aug 25, 2011 15:04 |  #2

Did you happen to test the YN by setting off your 580 when they are close together.. Say one in each hand?
Did you try it in other slave modes. I'm guess if you have a S2 there must be a S1
while I don't have a YN (LP160) I"ve pretty much done the same thing you are trying to do, with the only different being I was in manual mode not Ettl, and using rf-602's to trigger my 580.


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delhi
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Aug 25, 2011 16:27 |  #3

Gaarryy wrote in post #12998924 (external link)
Did you happen to test the YN by setting off your 580 when they are close together.. Say one in each hand?

no. Will try it though not sure what is that supposed to conclude?

Did you try it in other slave modes. I'm guess if you have a S2 there must be a S1

yes tried S1. YN 468 fires during AF assist preflash from the 7d and subsequently didn't fire during the real execution.


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msowsun
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Aug 28, 2011 21:06 |  #4

delhi wrote in post #12998414 (external link)
OK first off I know the Yongnuo yn468 is an optical slave unit while the 580ex is via light pulses.

So here I am with a 7D that has flash master control. I am wondering if I set the 7d flash to Master Wireless that will also fire off flash it should technically work right?

7D master: ETTL II
YN468: S2 (slave. Avoid pre-flash pulses and fire upon master's flash)
580ex: Slave. Group A.

In theory, it should work right? But in practice I only managed to get the 580ex to go off. YN468 didn't despite the 7d's flash fired as well.

Even if I switched from ETTL II to Manual, the yn468 didn't respond. It did only when I disable Wireless Flash altogether.

Thoughts?

Your results are correct. You can't mix two different slave systems.

The YN-468 has a simple system with 2 modes.(S1 and S2) One fires with any bright flash and the other fires on the sceond bright flash (ignores the preflash.)

The Canon system is very different because it uses coded light flashes to trigger the slave. It is more than just a preflash, because it also sends out more information. The Yongnuo flash won't be able to decipher those coded light pulses. It will either fire at the wrong time or not at all.


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mabviper
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Aug 28, 2011 21:18 |  #5

ETTL preflash and wireless ETTL preflash signatures are completely different. Yongnuo S2 mode doesn't account for the wireless ETTL preflash so you can't mix them together.


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Aug 30, 2011 08:42 |  #6

Not meaning to hijack the thread but I just did a search on the Yongnuo yn468 and do I understand that this flash unit also has an optical slave built in and in s2 mode it will ignore the canon preflash?

What I am trying to do is fire my 550ex with my ST-E2 transmitter and fire a second flash at the same time. When I attempt this using the wein slave the preflash fires my 430 and causes it to not fire at the appropriate time.

Additionally, is it possible to turn off the preflash?


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Aug 30, 2011 09:58 |  #7

Even if you can turn off the preflash, you will still have problems.

The ST-E2 uses coded light pulse to trigger the slave. Any optical slave flash will see those coded light pulses, and cause it not to fire, or fire at the wrong time.


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Hinson
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Aug 30, 2011 10:04 |  #8

Mike; thanks for the prompt response.

I'm playing with the units as we speak and it seems that if I set camera and both flashes (550EX, 540EZ) to manual, with ST-E2 on camera, and wein optical slave on the 540EZ both units fire at the same time. If I meter either light, then meter both, the F/stop goes up about 1.5 stops or so depending on where I have the flashes sitting. So, it appears I've solved my problem. I just need to shoot full manual.


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msowsun
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Aug 30, 2011 10:19 |  #9

I suspect that what is happening is the the position of the 540EZ is just far enough away, or positioned so that it is only responding to the manual flash of the 550EX.


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Hinson
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Aug 30, 2011 10:43 |  #10

You are correct. Just did some more accurate testing and the 540 was firing early. However, if I put the 540ez on camera and the wein on the 550ex then it seems to have worked. I now need to check the images in the computer to make sure that both were firing. I'm probably going to break down and buy another ex series and just sell the 540.


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Slaves: Mixing YN468 and 580ex
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