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Canon ST-E3-RT Speedlite Transmitter
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Canon ST-E3-RT Speedlite Transmitter

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4 Day Rental Price:



*up to 2nd day air - overnight available

The Canon ST-E3-RT Speedlite Transmitter is Canon’s first wireless transmitter based on radio-signal technology. Key features include:

  • 98.4-ft. range

  • Line-of-sight-free shooting with compatible Speedlites

  • On-board ratio and power-setting adjustment

Flexibility. The Canon ST-E3-RT Speedlite Transmitter gives users the flexibility of line-of-sight-free shooting when coupled with the Canon Speedlite 600EX II-RT, 600EX-RT, or 430EX III-RT. With a range of 98.4 feet and the ability to adjust ratios and actual power settings from the transmitter itself, the ST-E3-RT greatly simplifies elaborate lighting setups.

Intuitive Controls. The ST-E3 features a detailed LCD with clearly laid out, backlit buttons for full control of settings. Since the transmitter uses a radio signal, it’s only compatible with the radio-signal based 600EX-RT. Despite this, the ST-E3-RT transmitter still offers more control of its compatible Speedlite than any other trigger system out there.

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 ft. (30m)
Flash Ratio Control 1:8 - 1:1 - 8:1, power 1/2-stop increments
Flash Coverage Transmission Angle: 360° all around
Secondary Operation Confirmation Green Light
Lit: Radio Transmissions Okay 

Red Light
Lit: Not Connected
Blinking: Transmission Error/ Too many units (Primary units + Secondary units = more than 16 units) 

Orange Light
Lit: Sub-primary 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 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 Mode Power off after 5 min. of idle operation
Dimensions 2.65 (W) x 2.42 (H) x 3.05 (D) in. / 67.4 (W) x 61.5 (H) x 77.4 (D) mm
Weight 3.9 oz. / 110g (excluding battery)