CANON – 430EX III-RT – Speedlite Announced



Canon have announced the new 430EX III-RT Speedlite with both Master and Slave modes to Canon’s 2.4GHz RT radio system, as well as a Canon Optic Wireless Slave Mode.

The 430EX III-RT will be available in September for $299, including a Color Filter and Bounce Adapter cap.

The 430EX III-RT are the second Speedlite from Canon currently compatible with the RT radio system, the other being the flagship 600EX-RT.




The new 430EX III-RT are smaller, lighter, and provide faster recycle times than their predecessor the 430EX II.

Added features and refinements over the 430EX II include –

  • RT radio Master and Slave Modes.
  • Increased Tilt and Swivel, upward Tilt 90 degrees, Swivel 150 degrees left & 180 degrees right.
  • A larger Dot Matric LCD Screen.
  • New control wheel with increased FEC adjustment range.
  • Smaller and lighter body.
  • Faster recycle times.
  • 10 custom functions, and 8 personal functions.
  • Color Filter and Bounce Adapter and 2 cases included.






  • Guide Number (GN) of 43 metres at ISO 100 and 105mm
  • HSS to 1/8000th
  • Flash Mode – ETTL II /M / Multi
  • 1st Curtain Sync / 2nd Curtain Sync
  • FEC – 1/3rd Increments
  • Manual Flash – 1/128 – 1/1 output control (1/3rd increments)
  • 24-105mm Auto and Manual Flash Zoom
  • 2.4GHz RT Radio Master and Slave Modes
  • Canon Optic Wireless Slave Mode
  • Recycle Time – 0.1 – 3.5 Seconds
  • Flash Groups – Radio A/B/C/D/E, Optic A/B/C
  • Channels – Radio 1 – 15, Optic 1 – 4
  • 10 Custom Functions, 8 Personal Functions
  • Sound Prompt
  • Heat Protection
  • LCD Back Light
  • Crop Sensor Auto Zoom Option
  • AF Assist Light
  • Head Tilt 90 degrees, Swivel 150 degrees left & 180 degrees right
  • Tilt Swivel Lock Button
  • Large Dot Matrix LCD Screen
  • Bounce Card & Wide Angle Diffuser
  • Fast Clamping Foot



  • External HV Battery Port
  • USB Port for Firmware Updates
  • PC Sync Port
  • Weather Sealing


The Canon 430EX III-RT features a new larger dot matrix LCD display, and  interface control panel with new buttons and fast selection dial.




And Canon have provided a full Master and Slave mode for the Canon RT radio system.

This provides up to 5 groups, and up to 15 remote flash units. In slave mode a shutter release function allows remote cameras to be fired as well.

A Canon Optic Wireless Slave mode is also provided.




Being a step down from the flagship 600EX-RT, the 430EX III-RT do not provide any External HV Battery Port, or PC Sync Port.




The 430EX III-RT are slightly more compact and lightweight than the previous 430EX II.


Canon 430EX III-RT


And the 430EX III-RT are now supplied with a Color Filter and Bounce Adapter. As well as a base stand and case for the flash and another for the cap and filter.






Compatible Cameras Type-A EOS cameras (E-TTL II/E-TTL autoflash)
Guide Number Supports a shooting angle of view with a lens focal length of 24-105mm.The maximum Guide No. is approximately 141.1 ft./43m at ISO 100 and 105mm flash coverage.When the extendable wide panel is pulled out, the flash coverage is 14mm.
Number of Flashes Approx. 180-1200 flashes (with size-AA/LR6 alkaline batteries)
Recycling Time Normal flash: Approx. 0.1-3.5 sec.
Quick flash: Approx. 0.1-2.5 sec.

  • With size-AA/LR6 alkaline batteries
  • Flash-ready state indicated by lights (red for normal flash, green for quick flash)
Flash Range Effective flash range with EF 50mm f/1.4 lens at ISO 100

  1. Normal Flash:Approx. 2.3-77.4 ft./0.7-23.6m
  2. Quick Flash (at Guide No. 62.7 ft./19.1m):Approx. 2.3-44.6 ft./0.7-13.6m
  3. High-speed Sync (at 1/250 sec. shutter speed):Approx. 2.3-42.0 ft./0.7-12.8m
AF Assist Beam Emission method switchable in Personal Functions between Intermittent flashes and Infrared AF-assist beam.
Emitting small series of flashes is supported during viewfinder shooting, and Quick mode during Live View shooting or movie shooting.Effective Range (Approx.):
At Center: 2.3-13.1 ft./0.7-4.0m
Periphery: 2.3-11.5 ft./0.7-3.5m
Custom Functions 10 Functions
Personal Functions 8 Functions
Power Source Four AA-size/LR6 alkaline or AA/HR6 Ni-MH batteries
Internal Sound Generator N/A
External Power Source N/A
Dimensions Approx. 2.78 x 4.48 x 3.87 in./70.5 x 113.8 x 98.2mm
Weight Approx. 10.41 oz. / 295g







The Canon 430EX III-RT will be available now from $299 –


Adorama, B&H Photo, Amazon, UK, Ebay


Canon USA – Website

Canon Europe – Website



  1. John 6 years ago

    I wonder will it work with YN 622c?

  2. Nevel 6 years ago

    I guess some people want to feel theyre gettibg something special when buying an oem flash. I dont see any reasonable reason with such wonderful 3rd prty flashes from godox yongnuo shanny abd now pixel. Just dont see it. Especially this crap. Underpowered overpriced. 3.5 secobds recharge for such a weak flash. Ripoff flash.

    • Author
      Flash Havoc 6 years ago

      Hi Nevel,

      Actually I think these look like great flashes. Particularly for anyone after something smaller, but still with very usable power.

      The 3.5 second figure is with Alkaline batteries, with NiMH that should be significantly faster.

      The previous 430EX II are only around half a stop less powerful, and the 430EX III-RT appear to be the same. So that’s not a great loss especially taking into account the considerably smaller size.

      I certainly wouldn’t have expected Canon to provide a full radio Master function, so that’s a great win for common sense for once.

      Third party flashes may make more sense for radio slaves, it just depends on what your needs are.

    • Yuppa 6 years ago

      I can’t think of a single WONDERFUL 3rd-party flash: the all have issues. This flash is going to be awesome and it’s far, far from “crap”–Including a master mode is huge.

      I don’t see the point of denigrating something simple because it doesn’t fit a particular budget.

      People buy knock-offs because they’re cheaper: that’s it.

      • Author
        Flash Havoc 6 years ago

        Not exactly a TTL flash, though I think the V850 are pretty awesome for a manual flash (despite few battery hiccups).

    • Tom 5 years ago

      Because they are better made. Within a few weeks of use my yn500 stopped working, if it had been OEM I could have complained and got a replacement. I tried for weeks with yongnuo but to no avail. They might be better now or I got a dodgy unit, but why would I risk doing that again?

  3. Lala 6 years ago

    I think that it will be a great flash trigger. Especially for those who don’t like the canon St e3 rt missing a focus assist. Plus the price of this flash and the St e3 rt are similar.

  4. Steen Oervad 6 years ago

    What a wonderful flash for on-cam grabshots and travel etc etc…. Hopefully Yongnuo is paying close attention to this gorgous little thing.

  5. Craig 6 years ago

    These are actually pretty cool. Next thing I’d love to see is an extra small 2xAA RT slave flash for under $200.

    • Scott 6 years ago

      I agree. A 270 rt would be amazing!

  6. John 6 years ago

    Repeating myself from the first post, I wonder will it work with YN 622c?

  7. tomK 6 years ago

    So excited for these — we have three on pre order. I view it as an ST-E3 with a built in AF assist light and … a flash to boot.

    The PDF manual is now available for viewing on the Canon USA site and the wireless flash interface is a version 2 effort with better panel organization. Yay!

    • Author
      Flash Havoc 6 years ago

      Thanks tomK.

      It looks like they have managed to put all 5 Groups on the display at once in GR group mode. If that is right it looks to be a pretty decent Master interface.

  8. tomK 6 years ago

    Exactly — amazing that it’s so small at the same time. So excited to put them into the fleet.

  9. Andy 6 years ago

    Question: Can 430 III be a master and control YN600ex-rt too? If so, it would be nice since i have canon 600ex-rt and several YN600ex-rt


    • Author
      Flash Havoc 5 years ago

      Hi Andy,

      Yes the 430EX III-RT can be a master. I don’t have one yet to test this, though it should work as a transmitter to the YN600EX-RT as well as Canon RT flashes.

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