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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 09 Jan 2011 (Sunday) 13:44
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MK-RC7 Compatibility

 
bruceq
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Location: NE Pennsylvania
     
Jan 09, 2011 13:44 |  #1

I just received my wireless triggers from Link Delight and seem to be having an issue.

The will only trigger my 430EX... no flash trigger when attaching a 430EZ or either of my Quantaray QDC900's?

Is this a common issue with the cheaper flash triggers? Do the Cactus triggers work ok with all flashes?

I'm very disappointed right now. :cry:


Cameras - 5D MkII/Grip, 7D/Grip, T1i/Grip
Lens - EF-S 10-22, EF-S 18-55, EF 35-70, EF-S 55-250, EF 17-40L, EF 24-105L IS, EF 70-200 2.8L IS, EF 70-210, EF 100-400L, Sigma 150-500 OS, EF 100L IS, EF 180L, EF 85 1.8, EF 50 1.8

  
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toadhunter911
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Jan 09, 2011 14:13 |  #2

Start with the obvious. Everyone's on the same channel, right?


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bruceq
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Jan 09, 2011 14:27 as a reply to  @ toadhunter911's post |  #3

Yea, everything is on the same channel and I tried multiple channel settings. The led on the front of the receiver flashes indicating the signal was received. Like I said, it works fine with my 430EX.

I'm wondering if the receiver isn't giving a true dead short to the flash hotshoe? I measured the resistance drop at the hot shoe and it's triggering but maybe not low enough? Maybe the 430EX is more sensitive to the trigger than the older 430EZ or the QDC900's? The QDC900's are great flashes so I'm hoping I can find a way to make them work.

I've sent an email to Link Delight to see what they are willing to do since I don't see any compatability warnings listed on the website.


Cameras - 5D MkII/Grip, 7D/Grip, T1i/Grip
Lens - EF-S 10-22, EF-S 18-55, EF 35-70, EF-S 55-250, EF 17-40L, EF 24-105L IS, EF 70-200 2.8L IS, EF 70-210, EF 100-400L, Sigma 150-500 OS, EF 100L IS, EF 180L, EF 85 1.8, EF 50 1.8

  
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toadhunter911
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Jan 09, 2011 14:44 |  #4

Sounds like you've done everything right. Good luck with Link Delight. Hope everything works out, and let us know how it goes.

Craig


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spacetime
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Jan 09, 2011 18:10 |  #5

The MK-RC7 have a voltage output as low as 6v. That probably won't be enough to trigger the Quantarary nor the 430EZ though for the latter it's right around the threshold. You could try new brand name batteries and see if it works. The Cactus triggers do have a higher output voltage put I found them unreliable and too susceptible to interference. I believe the Cactus triggers operate on the 433 MHz frequency so the 580EXII will cause issues, but I'm not sure if the 430EXII does.




  
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bruceq
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Jan 09, 2011 19:44 as a reply to  @ spacetime's post |  #6

"The MK-RC7 have a voltage output as low as 6v. That probably won't be enough to trigger the Quantarary nor the 430EZ though for the latter it's right around the threshold. "

Now I'm really confused? I guess I should start with a simple question...

Do the cheap wireless triggers signal the flash by providing voltage to one of the hotshoe pins or by shorting the center pin to ground?


Cameras - 5D MkII/Grip, 7D/Grip, T1i/Grip
Lens - EF-S 10-22, EF-S 18-55, EF 35-70, EF-S 55-250, EF 17-40L, EF 24-105L IS, EF 70-200 2.8L IS, EF 70-210, EF 100-400L, Sigma 150-500 OS, EF 100L IS, EF 180L, EF 85 1.8, EF 50 1.8

  
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dedsen
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Jan 09, 2011 20:07 |  #7

Every flash I have worked with provide their own trigger voltage. The trigger or the camera just shorts the center pin to he contact in the slot of the flash shoe. You can take a paperclip and short these two pins together and prove it to yourself. It could be that the trigger is not providing a complete short. There may be too much resistance to trigger your flashes.



  
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bruceq
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Jan 09, 2011 20:12 as a reply to  @ dedsen's post |  #8

Thanks for the reply.. that's what I thought was the triggering event (short to center). I'm thinking the resistance drop is not enough to trigger the flash.

I'm still trying to come-up with a workable solution since these triggers work perfect on my 430EX - great range, no false triggers, no failed triggers, ect.


Cameras - 5D MkII/Grip, 7D/Grip, T1i/Grip
Lens - EF-S 10-22, EF-S 18-55, EF 35-70, EF-S 55-250, EF 17-40L, EF 24-105L IS, EF 70-200 2.8L IS, EF 70-210, EF 100-400L, Sigma 150-500 OS, EF 100L IS, EF 180L, EF 85 1.8, EF 50 1.8

  
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MK-RC7 Compatibility
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