YONGNUO RF-603 II – Now Available

YongNuo have released the long awaited updated RF-603 II manual flash triggers, and they are now available.

The RF-603 II are the follow up to the original and very popular inexpensive RF-603 flash triggers. And the MK II finally rectify many of the basic shortcomings of the original RF603 and RF-602 triggers.

The original RF-602 (released back in mid 2009) were the first really good reliable inexpensive manual flash triggers. But the RF-602 always had their shortcomings though too, and the later RF-603, while rectifying a few issues and adding some features, also added more obvious shortcomings as well.

The RF-603 II now look to finally rectify most of those issues, providing what should be a very capable and convenient trigger now for the low price point.


RF-603 II


Improved Features –

  • Higher Sync Speeds, up to 1/320th  (RF-602 were slow, RF-603 were very slow)
  • Locking Rings on trigger foot  (RF-603 and flash on top would fall off the camera)
  • Pass Through Hotshoe now usable  (see point above) though still manual only no TTL
  • Power Switch Finally Moved to the Side  (was blocked by the flash on 602 & 603)
  • Compatible with non Canon/Nikon and single firing pin cameras  (RF-603 was not)
  • Test Fire Button works off the camera hotshoe (for taking light meter readings)  (RF-603 did not)
  • 300v Safe Trigger Voltage (for hotshoe and PC sync port)  (602/603 where low 12 volt safe limit)


Not Improved –

  • PC sync port instead of a reliable 3.5mm mini-phone jack  (why oh why… still after all this time?)


Sync Speed –

Low sync speed was always one of the main shortcomings of the RF-602, and even worse with the RF-603. Now that this is improved with the RF-603 II, it simply means you should be able to get a clean frame without any shutter (or black band) showing in the frame at your cameras maximum sync speed (1/250th etc). Though the Canon 5D series sometimes have to drop to 1/160th even with an instant sync cord.

YongNuo are stating this as 1/320th maximum. But that figure relates to cameras with regular X-sync speed. Using a camera with an electronic shutter the RF-602 would achieve up to around 1/800th, and RF-602 1/600th. Many faster triggers would do 1/1200th plus, and that’s likely closer to where the RF-603 II would be now as well.


Locking Rings

The original RF-603 has no locking rings on the foot. This was a major oversight now that a flash could be mounted on top of the transmitter on the camera. They would both simply fall off the camera hotshoe! The RF-603 II now has locking ring and locking pin.

The RF-603 II is still manual pass through hotshoe only though (the extra contacts seen on the hotshoe are only for the flash wake up feature).

This is being picky, but we know the cut outs around locking rings makes them very hard on your fingers, and other triggers have already gone this way, and started going back again to full rings where possible. Just one cut out does the trick to access the screws underneath when needed. Batteries are standard AAA.

RF-603 II Base


Power and TX / TRX Switch –

Firstly the power switch has finally been moved to the side of the case, so that you don’t have to remove the flash from the trigger to switch it on and off like the RF-602 and 603 require. This alone would enough reason for many people to want to update.

More significant functionally though is the new TX – TRX option switch. The RF-603 are transceivers, meaning they are the same unit for transmitter and receiver, and can switch automatically between transmitting and receiving mode. This ability caused a number of extra issues in the original RF-603 though, like not being able to fire on non Canon/Nikon cameras, or fire the test fire button off the camera hotshoe.

So to help resolve these issues YongNuo have added a switch to the new FR-603 II allowing you to set them as either TX or TRX. TX being set to transmitter mode only, and TRX as self switching. TX mode is used when the transmitter is held in hand for taking light meter readings with the test fire button, or when used as transmitter only on the camera. If using combined flash and shutter release TRX mode would be used. Receivers would always need to be set to TRX.

RF-603 II Side

 Shutter Release –

One of the big advantages of the RF-603 (due to transceiver design) has always been the combined camera shutter release ability. You can fire the camera with an RF-603 used as a wireless remote shutter release, as well as fire remote flashes at the same time, with just the one radio trigger attached to the camera. Where as most non transceivers require 2 separate triggers  attached to the camera to do this. So the RF-603 offer a neater solution connected to the camera, and one trigger unit less cost.

This is where the TRX mode would also be used with the RF-603 II attached to the camera (via both the hotshoe, and a cord to a the cameras shutter release).

This also means you have backup transmitter, receiver, and shutter release units, as they are all the same unit and interchangeable.


Compatible with Non Canon / Nikon and Single Firing Pin Cameras –

With the rise of alternate brand mirrorless cameras its becoming increasingly important for radio triggers to be as universal, and compatible, as possible with non Canon/Nikon and single firing pin cameras.

The original RF-603 would not fire at all unless attached to a Canon or Nikon camera with full TTL contacts on the hotshoe. The RF-603 II will now work on most cameras provided they have a standard (non Sony) style hotshoe.

The flash wake up feature will not work on non Canon/Nikon cameras though.


Specifications –

  • Type: FSK 2.4GHz wireless remote control system
  • Transmission distance: 100cm
  • Channels: 16 channels
  • Shutter release: half-press, full-press
  • Shutter interface: 2.5mm socket
  • Studio flash light interface: standard PC socket
  • Max Sync Speed: 1/320 second
  • Battery: AAA x 2(3V)


Versions –

The RF603 II come in separate Canon RF-603C II , and Nikon RF-603N II versions.

Canon and Nikon versions are required for the flash wake up feature though. Apart from that the Canon and Nikon versions can work together.

The Canon RF-603 II are available with LS-2.5, C1 or C3 shutter release cords, and Nikon N1 or N3 cords.

The RF-603 II are also backward compatible with the original RF-603 (but not the RF-602).


C1 version:

— Canon 70D / 60D / 700D / 650D / 600D / 550D / 500D / 450D / 400D / 350D / 300D / 1200D/ 1100D / 1000D /
— Pentax K20D / K200D / K10D / K100D,
— Samsung GX-20 / GX-10

C3 Version:

— Canon 1D / 1DS / 5D / 6D/ 7D / 50D / 40D / 30D / 20D / 10D

N1 Version:

— D810 / D800 / D700 / D300 / D2X / D2H / D200 / D1H / D1X / D3X / D3
— N90s / F5 / F6 / F100
— Fuji Film: S5 Pro / S3 Pro
— Kodak: DSC-14N

N3 Version:

— Nikon D90 / D600 / D7100 / D7000 / D5100 / D5000 / D3100 / D3000



The RF-603 system is not directly compatible with YongNuo’s other popular YN-622, or now Canon compatible RT systems.



The RF-603 II are available now from around $36 a pair –

AdoramaAmazon, UK, B&H PhotoEbayYongNuo Ebay Store


YongNuo – Website


  1. Binh 7 years ago

    Dear Flash Havoc,

    I bought 2 sets of RF-603N II ( 4 pcs) to use with my Nikon D700. When I attached one to the flash and pressed the button on the other, the flash fired. But when I attached the other unit on the camera and shot with the camera, the flash did not fire. The one on the camera seemed to communicate with the camera since when I turned the camera on and off, the led of the unit turned on and off too.
    I guess there is something wrong with the setting. BTW, when the unit was still on the camera and I turned the camera off, I can trigger the flash with the unit on the camera.

    I tried all 4 units and two different flashes. The results were the same. I could not get the unit to wirelessly fire the flash.
    Do you have any idea what I did wrong?
    Thank you

    • Author
      Flash Havoc 7 years ago

      Hi Binh,

      I’m really not too sure there. Are you sure you have the transmitter pushed all the way into the hotshoe (and facing the right direction)?.

      I guess it could be a camera setting. I’m not that familiar with Nikon, though something like live view can disable the flash from firing. Do you have a manual flash like the YN-560 III?, as maybe you could start with the manual flash on the camera hotshoe. If you can get that to fire first, then the RF-603N II should work with the same settings.

    • Curtis 7 years ago

      Hi Binh
      You have to tell these triggers to be either a receiver or or a transmitter. With one on your camera and one on your flash you have to half press the shutter on the camera and you will see that both of the green lights come on. Press the button while the 2 green lights are on and the flash will fire, when the lcd on the camera goes off so will one of the lights on the trigger. Half press the camera shutter button to turn it back on again

    • Marko 5 years ago

      Hey Binh,
      Did you solve this somehow? I have a couple of RF603II’s and also a couple of YN-622N’s and they all behave the same on my Sony a6000 and my friend’s Nikon D7000.
      I can trigger them manually – using the trigger’s button – but when I put them on camera, they are not fired (and I can still trigger them manually).

  2. hi Flash Havoc,

    I was hoping to set up a photobooth with these and use the handheld wireless remote trigger to set off the shutter and other wireless flashes wirelessly, but apparently you need two tranceivers attached on the camera on separate channels, one for remote trigger and one to trigger the remote flashes?

    • Author
      Flash Havoc 7 years ago

      Hi there,

      With the RF-603 II you will only need the one transceiver on the camera to fire the shutter and the flashes. I think you can do the same with the original RF-603 as well, though the RF-603 II are much better triggers now.

      You could use 2 sets on separate channels as shown, but the RF-603 II are definitely designed to do this with one transceiver on the camera.

      • dan s 7 years ago

        I am looking to purchase a Sekonic Litemaster Pro L-478D. I have RF-603 II’s. Will a L-478D connected to a RF-603 II, via a sync cable, set off the flashes(yongnuo 560-III). If so what sync cable would work?

        • Author
          Flash Havoc 7 years ago

          Hi Dan,

          The RF-603 II do not have a PC sync input unfortunately, so you would need a hotshoe to PC sync cord, to attaching the hotshoe end to the RF-603 II transmitter foot.

          FlashZebra sell a hotshoe to PC sync cord – http://flashzebra.com/products/0273/index.shtml

          I don’t know if your aware though, these meters will simply measure a flash pulse as it goes off, just by optically detecting the light pulse. So you can just hit the test fire button on the flash trigger and let the meter measure the light as it fires. So you don’t necessarily need to wire the transmitter to the meter.

          Cordless triggering is mentioned here around 2:45 – https://www.youtube.com/watch?v=OPqILS6Vj4c

          • dan s 7 years ago

            Instead of the Sekonic L-478D I got a Sekonic L-758Cine. Could I use a RT-32N(pocket wizard module for the 758cine) to trigger test flashes on a single PocketWizard Plus X mounted on top of a on-camera Yongnuo rf-603II. I am hoping the pocketwizard will trigger my YN-560 III’s(via the rf-603 II) but not the shutter.

            • Author
              Flash Havoc 7 years ago

              Hi Dan,

              I can’t see that configuration working.

              You should be able to use a single Plus X to fire an RF-603 II transmitter (to then fire all the YN-560 III), but the 2 triggers would need to be connected the right way around.

              The Plus X would need to be connected via its flash port, then to the foot of the RF-603 II acting as transmitter.

              So again you would need a sync cord to hotshoe, but this time with a 3.5mm miniphone plug on the end. FlashZebra sell those as well, and Pocketwizard make one now as well.

          • Bartek Dziedzic 6 years ago

            FlashHavoc”The RF-603 II do not have a PC sync input unfortunately, so you would need a hotshoe to PC sync cord, to attaching the hotshoe end to the RF-603 II transmitter foot.

            FlashZebra sell a hotshoe to PC sync cord – http://flashzebra.com/products/0273/index.shtml

            I don’t know if your aware though, these meters will simply measure a flash pulse as it goes off, just by optically detecting the light pulse. So you can just hit the test fire button on the flash trigger and let the meter measure the light as it fires. So you don’t necessarily need to wire the transmitter to the meter.

            Cordless triggering is mentioned here around 2:45 – https://www.youtube.com/watch?v=OPqILS6Vj4c

            – See more at: http://flashhavoc.com/yongnuo-rf-603-ii-released/#sthash.rwyc37WA.dpuf

            I would like to use rf-603 or rf-605 on my camera but syncing via PC sync port. And on top of the Camera I would like to have a TTL Flash 580ex. Is there any chance to use it?
            I can’t understand why Yongnuo didn’t make a pc sync port (not only output but also Input) similiar as Phottix Strato II or TTL PASS Through hot shoe !

    • Curtis 7 years ago

      You only need one on top of the camera, but you also need shutter release cable to connect between the camera and the trigger. This will cost very little money on Ebay, just make sure that you get the right one for your particular camera. The nice thing is they are a two stage shutter release ie half press to focus.

  3. Kyle 7 years ago

    Flash Havoc,

    Hello, I recently purchased the Yougnuo rf-603II set up. I bought two sets to use one as an on camera transmitter with with a flash stacked on the hot shoe as well as run two more off camera flashes. So far they work great and were easy to set up. At the time of purchase I ordered them because they were compatible with the 60D and my flashes are 430exII. Last week I bit the bullet and ordered a 6D. Do you know if these unites are compatible with the 6D?

    Thank you

    • Author
      Flash Havoc 7 years ago

      Hi Kyle,

      Yes they should be fine with the 6D. I have not heard of any compatibility issues there.

      You may want to eventually consider the YN-622C-TX and YN-622C receivers though, as the sync speed of the 6D is bit more limited than the 60D. And you’d have full remote control or the 430EX II’s then.

      Looks like a super nice camera though, I’m still tossing up getting a 6D myself.

      • Kyle 7 years ago

        Dr. Flash Havoc,

        You are correct. I found no issues of communication between the 6D and the Yougnuo rf-603II set up. All cylinders are firing. I did have an issue and currently unresolved on controlling separate channels manually via the camera, to be continued…

        Thank you,


        p.s. the 6D is sweet so far

  4. EddyG 7 years ago

    Hi i just purchased the nikon d750 and i have the d7000 I was wondering which trigger should i buy i am shooting with 1 YN-560 III and if this works will be picking up a couple more for shoots with the d750.

    • Author
      Flash Havoc 7 years ago

      Hi Eddy,

      The YN560-TX will give you full remote manual power control of the YN-560 III flashes (and now the YN-560 IV as well).

      So that would be the best option. From there you could go down to the coming RF-605 which will only turn flash groups on and off (no remote power or zoom control like the YN560-TX).

      And from there down to the basic RF-603 II which will only fire the flash, no groups or remote control.

      Even if you get a YN560-TX, an RF-605 or RF-603 can be handy to have as a transmitter mounted on the camera to fire the flashes, while the YN560-TX is held in hand to take light meter readings etc. Or even using the RF-605 / RF-603 as a remote shutter release, with the YN560-TX as transmitter on camera.

      So what I’m trying to say is that is that its very handy to have one of each 🙂 (a YN560-TX and one of the others (preferably the coming RF-605)).

      • EddyG 7 years ago

        Thanks but as of right now i am just in the market for the trigger for my d750 and yn560 III So what would be your suggestion?

        • Author
          Flash Havoc 7 years ago

          The YN560-TX would be my suggestion, as it will give you full remote manual power control of the YN-560 III flashes (as well as simply firing them).

          I’m not sure if it was clear, but all of the triggers I mentioned will fire the radio receiver already built in to the YN-560 III flashes. So you only need one transmitter (of any I mentioned) to fire all your YN-560 III flashes.

          The YN560-TX just provided the most control.

  5. Glauco 7 years ago

    Hello there!
    I just want to let you guys know that the link to the official Yongnuo webpage about the RF 603 II has changed to http://www.hkyongnuo.com/e-detaily.php?ID=338
    Keep up the good work!

  6. Mark 7 years ago

    I passed on buying this one because I just love Meying TTL and grouping option.

    Please Yongnue make the mark III version with TTL and grouping available. Also please make your next EX series flash with RF-603 triggering option so that it will be fully compatible with your YN560 III and IV speedlight lineup.

    I hope not too much to ask?

  7. Bryan 7 years ago

    I just opened up my 603n ii set and installed one unit on the hot shoe of my Nikon D5200 with the shutter release cable connected. I also have a 560iii flash with the built in rf receiver. In my hand i wanted to hold the second 603N II to trigger shutter and flash remotely.

    I am sharing this as i spent a lot of time because when i plugged the device on the camera onto the hot shoe i lost the display on my camera and the 2 position(focus, fire) switches would not work although the device in my hand would release the shutter with a single press and fire the remote flash.

    Solution was actually quite simple and im alost embarrased to post it, but the cable connection to the device should seat all the way. It doesnt feel like it should as there is a lot of resistance, but once thiswas done everything worked perfectly.

  8. John Simpson 7 years ago

    I have a very old (but working perfectly) set of Bowens 800E’s, 400E’s and 200E’s and I currently trigger these wired via a Wein syncsafe. In the above it seems to suggest that the TXR could operate at a sync voltage of 300v (the Bowens being 200-ish). As this would be a errrrmmmm, somewhat leap of faith, to plug in and try, can you say if you know that this sync voltage is true and it would work. Yours (very) hopefully. Regards

  9. John Simpson 7 years ago

    Given that nobody on flashhavoc bothered to respond to this, the following might be useful for others.

    In the end I emailed Yongnou about this and a week or so later they responded back to say that the max trigger voltage is indeed 300V. I’ve since purchased another set of 603ii and they work perfectly connected direct to the old Bowens monolights.

    • Author
      Flash Havoc 7 years ago

      Thanks John,

      I do bother to answer many questions and emails every day. The information is free and I just do the best I can.

      This is not a particularly common issue anymore so many readers would not have the answer either. Thanks.

  10. Jim 7 years ago

    Thank you both, Flash Havok for the original review and John Simpson for your comments about it working properly at high voltage. I have a couple of Vivitar 283’s that have a trigger voltage of 251 and 248. When i first connect the volt meter, it jumps to 309 for a split second then drops to the 250 range. I sent Yongnuo two emails asking if they knew if anyone had successfully used the RF-603II trigger with a high voltage flash such as the Vivitar 283. So far no response. I have a pair of the triggers now so i guess I’m going to try it.

    Flash, why is this not a particularly common issue anymore?

    • Author
      Flash Havoc 7 years ago

      Hi Jim,

      Its not really that much of an issue anymore because most recent flashes have very small trigger voltages now.

      The old 283 are just not that common anymore. When you can buy YN-560 II etc for $50 and they are much faster, smaller, lighter, more powerful, zoom head, HV battery port etc, the 283 don’t get as much love as they used to.

      And now you have YN-560 III with receiver built in and remote power control for not much more, so they are taking over separate receivers to a large degree for basic manual flashes now as well. It almost makes more sense to just buy another manual flash than a receiver unit.

      • Jim 7 years ago

        Understood. I have the YN-560 III with the RF-603NII trigger as well and it works great. I picked up the two Vivitar 283s for $5 each at a photography show recently. I bought them as parts for fixing my old one that had the capacitor go bad. Turned out both worked fine (at least on self-test). I guess I’ll try one on a trigger and hope for the best. Either way, no more old flashes. 🙂

  11. Pavel Kudivani 7 years ago

    I have wonder if I can launch the flash when it’s on the trigger, which is mounted on camera body.
    I looked on some youtube videos and I can’t find relevant answer on this.
    for better imagination, here is a picture of what I mean 🙂

  12. Kiah Pettersson 6 years ago

    I have a Nikon d750. Which version should I buy N1 Version or N3 Version? Thank you

  13. Marlon Martins 6 years ago
    • Author
      Flash Havoc 6 years ago

      Nice work Marlon! 🙂

  14. Dimitrije 6 years ago

    Hi Flash Havoc,

    I am wondering if it is possible to connect yn 560-tx (wireless trigger) with canon 430 ex II directly or I need to get the 602/3 in between them?

    If I need 602/3, would I be able to control my canon flash through the 560-tx trigger or I would have to manually adjust the settings on my canon flash and use 602/3 as a signal receiver only?

    Hope it makes sense. Many thanks,

  15. Michelle 6 years ago

    Hi, I currently have the YN468 and it was working fine on my t2i as well as off camera with my cowboy studio wireless triggers. I upgraded to the Canon 6d and that flash won’t work in the hotshoe and it seems to only rarely be working with my cowboy studio transmitters. I do have 3 pocket wizard multimax’s but my yn468 doesn’t have an input for them. Do you know if the rf-603II will work wiht the YN468 and the Canon 6d? Also, do you know if either the YN560-II or the YN560-III would work with the pocket wizard multimax’s? Thank you!

    • Author
      Flash Havoc 6 years ago

      Hi Michelle,

      The YN-468 should work ok on manual triggers like the RF-603 II, though they should work ok on your Cowboy Studio triggers as well unless they are playing up.

      To connect a flash without sync port to the PocketWizards you would need a hotshoe cord.

      Yes the YN-560 II and III should work with your PocketWizards. Though if you fire them via other triggers you will lose any remote power control ability.

      I would personally grab the YN-560 III (or IV) and a YN560-TX. (And possibly an RF-603 II receiver for your YN-468. Though that money is likely better put towards another YN-560 III).

      The YN-560 III / IV have their own radio built inside, and its very convenient and reliable, and the remote manual power control is great as well. Then you have the PocketWiazrds for back up in needed. 95% of the time the built in radio should do the job and be more convenient.

      Also you can also fire the YN560 III / IV via an RF-603 II mounted on the camera, and then use the YN560-TX in hand for remote power control if you don’t want the larger transmitter on the camera. So the RF-603 II are handy to have.

  16. Glen Hurd 6 years ago

    Same problem as BINH. Using Nikon D300. Didn’t see a solution, so posting problem again.
    I have 1st device mounted firmly on Nikon Hotshoe (in right direction – it will only go one the correct way). I turn both devices to TRX. If I push button on 1st device (on Nikon), flash fires on 2nd device. If I fire camera (without using LiveView) using normal shutter, flash doesn’t fire. If I turn 1st device to TX and repeat, nothing happens when I fire camera with normal shutter. Flash is always awake, and always fires from button on 1st device. Obviously, both devices have power or the button on the 1st device wouldn’t fire the flash on 2nd device.

    Now, if I connect the shutter cable from camera to 1st device, and then fire the camera with normal shutter, the flash works in TRX mode. It will not work in TX mode.
    And once the camera is firing the flash, I can unplug shutter cable from 1st device, and it will continue to operate as it should – as long as I leave it in TRX mode.
    However, if I switch it to TX mode, it will stop working entirely until I set it back to TRX and re-insert the shutter cable.

    I think there is an issue with the 603 and “some” Nikon cameras – maybe the D*00 series.
    I’ve tried swapping out devices. I’ve measured pins on the devices to make sure they are making good contact with hotshoe. Nothing works except my work-around.

    This isn’t rocket science.
    What am I missing here?

  17. Glen Hurd 6 years ago

    Also, when following the directions for remote shooting with flash trigger sync, I can get the 2nd device (mounted under the flash) to trigger the camera and make it fire. But the flash is not in sync. So while the 2nd device can trigger the camera, the flash – although it fires – is useless.
    And, yes, when triggering the camera, I use the half-press on the 2nd device to make sure focus is set and camera is ready to fire.
    Any help appreciated.
    All in all, still not a bad buy.
    Just not working as advertised for me.

  18. Andre Matos 5 years ago

    Hello Flash Havoc,

    Can I use an old flash, in the unit that is connected to the camera ? or the protection of 300v applies only using the receiving unit?

    Sorry bad english , cheers from Brazil, Best Regards,

    Andre Matos

  19. joseph 5 years ago

    hi i just bought a godox AD360 II-N flash and i can not use my RF603N II ????WHY ??? it worked well on the 180 godox

  20. Zarif Islam 3 years ago

    Hi, I have a canon 80 D and I bought YN 603 C II TRIGGERS but they are not working. The flash is not firing even after I kept it in manual mode.

    • Author
      FLASH HAVOC 3 years ago

      Hi Zarif,

      Will the flash fire via the transmitter test fire button?. And what is the flash model by the way.

  21. Timmee 3 years ago

    How did cheapskates trigger flashes with meters before radio triggers?
    I had my old Sekonic L-408 in corded mode & wired by 5m pc sync cord to an ancient Nikon SB-20 flash (set to minium manual output and safely located under a background stand at pointing at the ceiling.) I kept the meter close by the model so I’d just walk over to the model, pick the meter and fire. Worked every time!

    Now I have a YN560TX on the D700 & D7100 to fire everything (Bowens Esprits with RF-603AC triggers in like between the heads and power cords, Younguo 560 Mk3 soeedlights, and various Nikon Speedlights on manual settings. The SB-26’s have their own built-in slaves and don’t even require radio triggers.

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