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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 23 Mar 2014 (Sunday) 03:01
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iShoot E-TTL Off-Camera DUAL-Hot-Shoe Cord

 
Arte ­ Automobilistica
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Mar 23, 2014 03:01 |  #1

Hi

I'm looking at buying one of these

http://www.ebay.com …Canon-OC-E3-/160981686697 (external link)

They say that the 2nd (off camera ) shoe is the mini size and only supports the canon 600EX and 580EX ii. Is the shoe on these flashes different? Why won't other flashes work?

Does anyone have any experience using this cord without a 600/580ii?

Thanks


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OceanRipple
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Mar 23, 2014 06:04 |  #2

Hi, I've used a few of these 'Dual' hot-shoe TTL cords - they are not 'plug & play'.

Neither Canon nor Nikon make these Dual cords, the reason being that they usually do not behave as you might expect.

If you use a Canon Speedlite in only one Hot-shoe at a time, all is well. If you use two and set them both to M flash using their own buttons/controls, again, all should be well. Both hot-shoes are standard Canon style hot-shoes - the far end has a simple pc out jack as well. You might, that's might, get away with using one of the two set to ETTL, leaving the other in M.

The problem seems to be that the camera system 'expects' to receive voltages & code from a single attached Speedlite and cannot cope with those combined from two attached devices. An exception may apply if 1) both attached Canon Speedlites are identical, 2) both have identical settings on their screens, and 3) they are pre 'II' series Canon Speedlites.

Have I put you off?




  
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msowsun
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Mar 23, 2014 08:51 |  #3

I am quite sure what you have here is a very poor English translation which is very common in these ebay listings.

Here is what they are really trying to say.......

IMAGE: http://i2.photobucket.com/albums/y17/msowsun/photo%20stuff/Photo14/Clipboard01-5.jpg~original

Mike Sowsun / S110 / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 18-135mm STM / EF-S 18-135mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.8 STM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 1.4x II
Full Current and Previously Owned Gear List over 40 years Flickr Photostream (external link)

  
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Arte ­ Automobilistica
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Mar 23, 2014 12:04 as a reply to  @ msowsun's post |  #4

Hi Thanks for the quick replies. While not put off I am now sufficiently wary not to have 2ttl flashes at once. Am I right in thinking that if I used the "remote" shoe for ettl, I could use the camera shoe to fire my yongnuo 600TX trigger?


NelPhotos.co.uk (external link)
Work: 7D + Sigma 100-300 4
Play: Kiss X4 + 15-85 IS + 10-22 + 50 1.8 II + Vivitar 1 70-210 3.5
EOS-M + 18-55 + FD 50 1.4 + FD 135 2.8 + Tamron 35-80 1A
G9, SX280 HS + CHDK, Casio EX-FH 100, Toshiba L505-144 & iPad 2

  
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OceanRipple
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Mar 23, 2014 12:51 |  #5

" .. if I used the "remote" shoe for ettl, I could use the camera shoe to fire my yongnuo 600TX trigger? .. "

Hi, I don't know. Once you depart from the 'two-identical-units' guideline, all bets are off. You might be lucky - I tried some combinations including a Phottix Odin TCU in one of the shoes and I definitely wasn't lucky! When an Odin TCU controls in M, it does so by hijacking the ETTL algorithm, so I wasn't expecting success. My guess would be that the 600Tx is unlikely to work while sharing a 'Dual' cord either - if the further shoe unit was in M, the chances of success for the closer 600Tx might be higher. Usually you are just better off buying an extra Rx or TRx. Good luck.

(PS; You can run an ETTL Speedlite from your 7D's hot-shoe - while running a Yn RF 602 Tx driven from the camera's pc sync out. I presume the 600Tx is similar, though you'd need a cord-to-hot-shoe adaptor etc. - but no wake-up & slightly slower sync.)




  
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Arte ­ Automobilistica
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Mar 23, 2014 13:49 |  #6

OceanRipple wrote in post #16779829 (external link)
(PS; You can run an ETTL Speedlite from your 7D's hot-shoe - while running a Yn RF 602 Tx driven from the camera's pc sync out.)

Nice idea!

A bit more research has revealed
"Upgraded version of Yongnuo FC-681 TTL cord, there are two hot shoes for both two ending side, so you can use this FC-681 TTL cord in two flashes at the same time, and also, it support all functions of Canon EOS Camera, as well E-TTL functions of Canon flash system"
http://www.ebay.com …_trksid=p3984.m​1436.l2649 (external link)

And what I was thinking with the 600tx
http://www.ebay.com …_trksid=p3984.m​1436.l2649 (external link)

Oh well as you say neither Canon nor Nikon have a dual shoe cords...


NelPhotos.co.uk (external link)
Work: 7D + Sigma 100-300 4
Play: Kiss X4 + 15-85 IS + 10-22 + 50 1.8 II + Vivitar 1 70-210 3.5
EOS-M + 18-55 + FD 50 1.4 + FD 135 2.8 + Tamron 35-80 1A
G9, SX280 HS + CHDK, Casio EX-FH 100, Toshiba L505-144 & iPad 2

  
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OceanRipple
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Mar 23, 2014 14:03 |  #7

Hi, Yes I believe that does work with the 600Tx. My old 602 sets had the original 602 Tx (the one with the pc 'in' jack) - that didn't work - on the Yn version, it gave a spontaneous strobing effect! But I did read somewhere that the 600 Tx was OK.




  
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iShoot E-TTL Off-Camera DUAL-Hot-Shoe Cord
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