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Canon ST-E3-RT Transmitter

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Canon ST-E3-RT Transmitter Description


The Canon ST-E3-RT Speedlite Transmitter can help you take full advantage of all the latest features on Canon's top-of-the-line 600EX-RT flash. The ST-E3-RT makes complex lighting setups simple by facilitating radio-controlled, two-way wireless transmission up to 98.4' away, among up to five groups or fifteen individual Speedlites. It has controls similar to the new Speedlite 600EX-RT, including multiple flash metering options, and a variety of flash modes. Compact design with highly reliable construction combined with a clearly laid-out information panel and buttons with back lighting make this an indispensible tool for advanced professional flash photography. The ST-E3-RT represents the next generation in wireless flash systems. 


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' (30 m), all at a 360 degree angle.

Fire compatible Speedlite flashguns over distances of up to 30m. Radio-frequency control provides reliable operation even when direct line of sight is not possible.

KEH Specifications

  • 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.
  • Functionality: Up to 5 groups, or 15 individual flashes can be controlled via 1 transmitter.
  • Settings: 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.
  • Connections: Improved hot shoe contacts for more reliable information transmission and operation.
  • Indicators: Slave operation confirmation: 
    • Green Light--Lit: Radio Transmissions Okay
    • Red Light--Lit: Not Connected
    • Blinking: Transmission Error/ Too many units
    • Orange Light--Lit: Sub-master transmission
    • Blinking: Receiving remote release shooting, linked shooting signal



  • Canon EOS Digital SLR Camera
Additional Information

Sync Speed : High-Speed Sync provided (EOS-1D X and EOS 5D Mark III only)

General information

Brand Name Canon
Product Model ST-E3-RT
Product Line Speedlite
Manufacturer Part Number 5743B002
Manufacture GTIN 0013803142488

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