Canon ST-E3 RT Radio Transmitter


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  • Product Description
  • Specifications
  • What's in the Box?
  • Warranty

Canon ST-E3 RT Radio Transmitter

Add radio controlled two way wireless flash capability to your Canon system

  • Compatible with Canon E-TTL / E-TTL II
  • Up to 5 groups, or 15 individual flashes can be controlled via 1 transmitter.
  • 30m Range
  • 8 custom functions
  • 3 personal functions

TypeRadio transmissions wireless Speedlite transmitter
Compatible CamerasType A EOS cameras (E-TTL II/E-TTL autoflash)
Sync SpeedHigh-Speed Sync provided (EOS-1D X and EOS 5D Mark III only)
Flash Exposure ConfirmationFlash exposure confirmation lamp lights in green
* If it does not light, shooting is not performed with the standard exposure
AF Assist BeamN/A
Wireless Functions
Transmission SystemRadio Transmission
Transmission RangeApprox. 98.4 ft. (30m)
Flash Ratio Control1:8 - 1:1 - 8:1, power 1/2-stop increments
Flash CoverageTransmission Angle: 360° all around
Slave Operation ConfirmationGreen 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 CancellationThe test flash button can be pressed to test if the slave units fire or cancel the auto power off status.
Power SourceAA/LRG Alkaline Batteries x2 (Ni-MH and Lithium batteries can also be used)

Battery Life: Approx. 10 hours continuously *When using AA/LR6 alkaline batteries used (At a room temperature +23°C/73°F).
SE ModePower off after 5 min. of idle operation
Dimensions2.65 (W) x 2.42 (H) x 3.05 (D) in. / 67.4 (W) x 61.5 (H) x 77.4 (D) mm
Weight3.9 oz. / 110g (excluding battery)
  • Canon ST-E3-RT Speedlite Transmitter
  • Soft Case
12 Month Warranty