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Answer:
Yes and no - Yes it works as traditional IR way, but that requires clear line of sight between two. You cannot use radio feature of 600ex-rt to trigger 430ex
By M. Joshi on December 11, 2013
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The Canon 600EX-RT speedlight is designed to work, wirelessly, with other 600EX-RT units (the "RT" stands for Radio Transmission), or with the Canon ST-E4; you no longer need 3rd party transceivers (such as the PW Plus III) to incorporate off-camera flash using radio transmission. Another company, YongNuo, has develope… see more The Canon 600EX-RT speedlight is designed to work, wirelessly, with other 600EX-RT units (the "RT" stands for Radio Transmission), or with the Canon ST-E4; you no longer need 3rd party transceivers (such as the PW Plus III) to incorporate off-camera flash using radio transmission. Another company, YongNuo, has developed a shoe-mount transmitter (the YN-E3-RT) that is fully compatible with the 600EX-RT and also has an AF assist light, which the Canon ST-E4 doesn't even have.
If you're still set on using your PW Plus III with your 600EX-RT, you can do so but you will only be able to use the flash in Manual Mode (not E-TTL), and you won't be able to change your flash settings remotely. This is fine if you're shooting in a controlled environment, such as a studio, where your lighting won't change but if you're looking to use off-camera flash outdoors and/or in changing lighting conditions, I'd highly recommend getting another 600EX-RT, which you can then use as a transceiver on-camera to fully control your off-camera one. If that's too expensive an option, get the Canon ST-E4 which also mounts onto your hot-shoe and gives you full control over your 600EX (or get the YongNuo version, which does the same thing but is a lot less expensive and also has the benefit of an AF assist beam for low-light focusing). see less

By M. Emrich on June 1, 2014
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Aloha Andrew, Don't know to what extent you mean 'USE', but I tried it on my friends 5D mrk i and it works perfect in ETTL and manual, I also tried the ST-E3 on camera (5D mrk i) and fired the 600ex rt off camera and that worked too. I think when Canon says it's built for the 1DX and 5D mrk iii, I believe they're talk… see more Aloha Andrew, Don't know to what extent you mean 'USE', but I tried it on my friends 5D mrk i and it works perfect in ETTL and manual, I also tried the ST-E3 on camera (5D mrk i) and fired the 600ex rt off camera and that worked too. I think when Canon says it's built for the 1DX and 5D mrk iii, I believe they're talking about it's ability to work in conjunction with the camera's newer 61 point focusing systems. Hope that helps! see less
By M. Santos on June 16, 2014
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USA warranty -- detail at: http://www.usa.canon.com/cusa/professional/products/professional_cameras/speedlite_flash_lineup/speedlite_600ex_rt#ServiceAndSupport
By Charlie K on February 10, 2014
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Hi Paul,
The ST-E2 used a special battery that was actually hard to find in some areas. You'll be glad to know the ST-E3-RT uses standard AA batteries. A definite plus!

By MBK on October 13, 2013
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Dear,
Yes this flash does work with EOS 7D. Canon is curently running a promotion on this flash.
Thank you!

By True Modern Electronics on May 3, 2013 SELLER
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I haven´t had any problem, maybe you should check if your units has the same group ID!!! if the problems continue you should sent you unit to service... have try to fired your flas with another master unit?
By hector e. on May 26, 2014
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It will work up to 1/8000 sec as long as you are in High-speed sync mode. Just remember that the flash will work at a much reduced power level in that mode.
By Judi Z on June 27, 2014
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Answer:
The following is an answer to a similar question for this product on this site.
"Yes it is compatible EOS 1Ds Mark III EOS 1D Mark III / IV 5D Mark II / III 7D 60D / 50D / 40D Rebel T3i / T2i / T1i / XSi / T3 / XS."
There are probably some limitations. I suggest that you call Canon support at 1-800-OK-CANON (toll free… see more
The following is an answer to a similar question for this product on this site.
"Yes it is compatible EOS 1Ds Mark III EOS 1D Mark III / IV 5D Mark II / III 7D 60D / 50D / 40D Rebel T3i / T2i / T1i / XSi / T3 / XS."
There are probably some limitations. I suggest that you call Canon support at 1-800-OK-CANON (toll free)
1-800-652-2666. see less

By Regus Patoff on November 30, 2013
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Yes, Canon US site has a brochure you can download, and page 31 of the PDF shows the M Manual setting ability.
By Chris Martison on September 12, 2013