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Canon ST-E3-RT
Speedlite Flash Transmitter


For sophisticated wireless flash setups, there's nothing like the new Speedlite Transmitter ST-E3-RT*.
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Our Price: $360.36
List Price: $470.00
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Canon ST-E3-RT
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For sophisticated wireless flash setups, there's nothing like the new Speedlite Transmitter ST-E3-RT*. Facilitating radio controlled, two-way wireless transmission up to 98.4 feet, among up to five groups or fifteen individual Speedlites, the ST-E3-RT represents the next generation in wireless flash systems. With operational controls similar to the new Speedlite 600EX-RT, including diverse flash metering options, and a number of flash modes, the Speedlite Transmitter ST-E3-RT makes complex lighting setups simple. With a compact design and highly reliable construction, combined with a clearly laid-out information panel and buttons with back lighting and more, the Speedlite Transmitter ST-E3-RT is an indispensible tool for advanced, professional flash photography.

Note: Because it does not have an optical transmission function, the Speedlite Transmitter ST-E3-RT is not compatible with earlier Speedlite models such as 580EX II.


  • Newly-designed wireless system uses 2-way radio wave communication for enhanced communication among master and slave units
  • Achieves a transmission distance of up to 98.4 ft./30 m, all at a 360 degree angle.
  • Up to 5 groups, or 15 individual flashes can be controlled via 1 transmitter.
  • Supports E-TTL II flash, manual flash, stroboscopic and auto external flash metering.
  • Dot matrix LCD panel displays all pertinent information simultaneously and backlit control panel means easy operation.
  • 8 types of custom functions, 3 types of personal functions.
  • Improved hot shoe contacts for more reliable information transmission and operation; compact design is approx. 2.65 (w) x 2.42 (H) x 3.05 (D) in.



  • Type: Radio transmissions wireless Speedlite transmitter
  • Compatible Cameras: Type A EOS cameras (E-TTL, II/E-TTL autoflash)
  • Sync Speed: High-speed sync provided (EOS-1D X and EOS 5D Mark III only)
  • Flash Exposure Confirmation: Flash exposure confirmation lamp lights in green
    *If it does not light, shooting is not performed with the standard exposure
  • AF Assist Beam: n/a

Wireless Functions

  • Transmission System: Radio Transmission
  • Transmission Range: Approx. 98.4' (30m)
  • Flash Ratio Control: 1:8-1:1-8:1, power 1/2-stop increments
  • Flash Coverage: Transmission Angle: 360deg all around
  • Slave operation Confirmation:
      -  Green Light:
          *Lit: Radio Transmissions okay
      -  Red Light:
          * Lit: Not Connected
          * Blinking: Transmission Error/ Too many units (Master units + slave units = more than 16 units)
      -  Orange Light:
          *Lit: Sub-master transmission
          *Blinking: Receiving remote release shooting, linked shooting signal
  • Slave Unit SE Mode Cancellation: The test flash button can be pressed to test if the slave units fire or cancel the auto power off status.


  • Power Source:
      -  AA/LRG Alkaline Batteris x2 (Ni-MH and Lithium batteries can also be used)
      -  Battery Life: Approx. 10 hours continously (when using AA/LR6 alkaline batteries used [at a toom temperature of 73F/23C])
  • SE Mode: Power off after 4 min. of idle operation
  • Dimensions(WxHxD): 2.65"x2.42"x3.05"/ 67.4x61.5x77.4mm
  • Weight: 3.9oz./ 110G (excluding battery)

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