Wireless Transmitter

Canon Speedlite Transmitter ST-E3-RT

Fire compatible Speedlite flashguns over distances of up to 30m. Radio-frequency control provides reliable operation without direct line of sight.

  • Reliable off-camera flash control

    Control compatible Canon Speedlite flashguns over distances up to 30m. 2.4GHz radio frequency triggering operates reliably, even when shooting outdoors and around corners – direct line of sight not required.

  • Multiple flash photography

    Create intricate multi-flash lighting set ups, triggering up to 15 Speedlite flashes with a single camera-mounted Speedlite Transmitter ST-E3-RT. E-TTL II flash metering makes exposure control easy.

  • Remote camera control

    Trigger an EOS camera fitted with a Speedlite Transmitter ST-E3-RT 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.

  • Easy to use design

    The Speedlite Transmitter ST-E3-RT is sealed against dust and moisture to the same degree as professional EOS cameras and L-series lenses. It features an easy to read back-lit LCD control screen and is powered by two AA/LR6 batteries.


  • Radio frequency remote flash trigger

  • Fire selected Speedlites from 30m away

  • Part of the E-TTL II flash system

  • Controls up to 15 flashguns

  • Remote camera triggering

  • Weather sealed against dust and moisture

What's in the box

Everything you need to capture amazing remote flash images, just add flashes and cameras

  • Speedlite Transmitter ST-E3-RT

  • Soft Case

Maintenance, Upgrades & Repairs

Keep your Canon cameras and accessories up to date with latest firmware and service updates, or book your equipment into your nearest authorised repair centre.

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