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Wireless Transmitter

Canon Speedlite Transmitter ST-E3-RT (Ver.2)

Fire compatible Speedlite flashguns over distances of up to 30m. Radio-frequency control provides reliable operation without direct line of sight. Additional features for the Speedlite EL-1.

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Remote flash trigger for Speedlite flashes

Sophisticated remote flash photography is made easy with the ST-E3-RT(Ver.2) fire multiple flashes at once, and control settings from a distance. Fire multiple cameras from a distance for synchronised shooting.

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Speedlite Transmitter ST-E3-RT ver.2-display
Speedlite Transmitter ST-E3-RT ver.2- BACK SLANT LEFT
Speedlite Transmitter ST-E3-RT ver.2-FRONT SLANT LEFT

  • 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(Ver.2). E-TTL II flash metering makes exposure control easy.

  • Remote camera control

    Trigger an EOS camera fitted with a Speedlite Transmitter ST-E3-RT(Ver.2) 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(Ver.2) 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.

  • Wireless second curtain sync

    Speedlite Transmitter ST-E3-RT(Ver.2) supports wireless second curtain sync for the EL-1 when fired remotely, plus 1/8192 nuance lighting and flash exposure (FE) memory.

Specifications

  • 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

  • Second curtain sync, 1/8192 power and FE memory for EL-1 and later Speedlites

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Additional functions supported by ST-E3-RT(Ver.2) vs ST-E3-RT

EL-1 packshot front in the comparison table

Speedlite EL-1

SPEEDLITE EL-1
Speedlite 600EX II-RT in comparison table with EL-1

Speedlite 600EX II-RT

Speedlite 600EX II-RT, 600EX-RT, 430EX III-RT

Cameras released from 2020 (e.g., EOS-1D X MkIII, EOS R5/R6 and later, but excluding EOS 850D)

Compatible cameras may need the latest firmware update.

-
-

Wireless second curtain sync

Yes
Yes

Low Power (1/8192)

Minimum flash output of 1/8192 possible with Speedlite EL-1 only (1/128 with high-speed sync).

Yes
No

FE memory

Flash output amount may slightly differ between that of E-TTL autoflash and manual flash

Yes
Yes

Other cameras from before 2020 (e.g., EOS-1D X Mark II)

Compatible cameras may need the latest firmware update.

-
-

Wireless second curtain sync

No
No

Low Power (1/8192)

Minimum flash output of 1/8192 possible with Speedlite EL-1 only (1/128 with high-speed sync).

Yes (no camera UI)
No

FE memory

Flash output amount may slightly differ between that of E-TTL autoflash and manual flash

Yes
Yes

Speedlite Transmitter ST-E3-RT ver.2- BACK SLANT LEFT

What's in the box

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

  • Speedlite Transmitter ST-E3-RT(Ver.2)

  • 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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