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Canon Speedlite Transmitter ST-E3-RT(Ver.2)#5743B012

A radio-frequency flash trigger aimed at professional photographers using an off-camera flash


  • Radio frequency remote flash trigger
  • Control multiple compatible Canon Speedlite flashguns over distances up to 30m
  • Wireless second curtain sync¹

View Overview

Guaranteed compatibility with:

  • EOS 100D          
  • EOS 250D          
  • EOS 40D             
  • EOS 650D          
  • EOS 6D

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  • Radio frequency remote flash trigger
  • Control multiple compatible Canon Speedlite flashguns over distances up to 30m
  • Wireless second curtain sync¹

View Overview


Fire up to 15 compatible Speedlite flashguns over distances of up to 30m. The updated Canon Speedlite Transmitter ST-E3-RT(Ver.2)² enables all the wireless radio features of the Canon Speedlite EL-1, including wireless second curtain synchronisation, low power (1/8192) output and Flash Exposure (FE) memory. It also enables support for some of these additional capabilities with other compatible Speedlite models. The 2.4GHz radio frequency triggering operates reliably, even when shooting outdoors and around corners, meaning that having a direct line of sight is not required. Trigger an EOS camera¹ fitted with a Speedlite Transmitter ST-E3-RT(Ver.2) from a second unit or from a compatible Speedlite flashgun, such as the Speedlite 600EX II-RT. Up to 15 cameras can be triggered at once, for synchronised shooting.


  • Supports wireless second curtain sync and Flash Exposure (FE) memory with compatible cameras/Speedlite¹, plus 1/8192 nuance lighting with the EL-1¹
  • Radio frequency remote flash trigger
  • Fire selected Speedlites from 30m away
  • Part of the E-TTL II flash system
  • Ideal for creative flash photography as it controls up to 15 flashguns
  • Remote camera triggering for up to 15 cameras at once for synchronised shooting
  • Weather sealed against dust and moisture

What's in the box

  • Canon Speedlite Transmitter ST-E3-RT(Ver.2)
  • Soft Case


  • EOS 100D          
  • EOS 250D          
  • EOS 40D             
  • EOS 650D          
  • EOS 6D
  • EOS 10D             
  • EOS 5D
  • EOS 60D             
  • EOS M/ EOS M2
  • EOS R5 
  • EOS-1Ds            
  • EOS 1100D        
  • EOS 20D             
  • EOS 30D             
  • EOS 400D          
  • EOS 50D             
  • EOS 5D Mark II 
  • EOS 5DS / 5DS R
  • EOS 70D             
  • EOS D60             
  • EOS M10            
  • EOS M200         
  • EOS R6 
  • EOS-1D X /EOS-1D C      
  • EOS-1D X Mark II            
  • Speedlite EL-1
  • EOS 5D Mark IV
  • EOS 60Da          
  • EOS 750D /760D             
  • EOS 80D             
  • EOS M6
  • EOS R/RA           
  • EOS-1D Mark III
  • EOS-1D Mark IV
  • EOS-1Ds Mark II
  • Speedlite 430EX III-RT
  • EOS 200D          
  • EOS 500D          
  • EOS 600D          
  • EOS 77D             
  • EOS 7D
  • EOS 850D          
  • Speedlite 600EX-RT
  • EOS 2000D / EOS 1300D
  • EOS 550D          
  • EOS 6D Mark II 
  • EOS 700D          
  • EOS 7D II           
  • EOS M3
  • EOS M5
  • EOS-1D X Mark III
  • Speedlite 600EX II-RT
  • EOS 1200D        
  • EOS 300D          
  • EOS 5D Mark III
  • EOS 800D          
  • EOS M50            
  • EOS M6 Mark II
  • EOS RP 
  • EOS-1D
  • EOS 350D          
  • EOS 4000D
  • EOS 450D          
  • EOS 90D             
  • EOS D30             
  • EOS-1D Mark II / N         
  • EOS-1Ds Mark III            
  • EOS R3
  • EOS R10
  • EOS R7
  • EOS R50
  • EOS R8
  • EOS R100


For a full list of specifications and disclaimers, please visit https://www.canon.ie/cameras/speedlite-transmitter-st-e3-rt-v2/specifications/

Reviews & Questions

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Delivery and Returns


Our online store remains open and deliveries are still being made as normal.

Free standard delivery on all orders of € 30 and more. Delivery within 4-6 working days.

Orders below € 30 are subject to a delivery charge of € 4.99.

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You have 30 days in which to return your item(s) for free and receive a full refund. Terms & conditions apply.

Please note we are unable to refund (unless faulty or not as described) opened ink jet and laser cartridges.

More returns information

¹ Please check the specifications for the full feature-set and camera/Speedlite compatibility, as this will vary depending upon equipment used.

² If you own the original Canon Speedlite Transmitter ST-E3-RT (pre-2021 generation), then a chargeable service update is planned for release later, via specified Canon service facilities. For details, costs, and when this service will be made available, please visit https://www.canon.ie/pro/services/upgrades/speedlite-transmitter/.

*Available wireless (radio transmission) features depend on the Speedlite and camera combination, please see the ST-E3-RT(Ver.2) product page for more information.

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