Canon Speedlite Transmitter ST-E3-RT


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

Features About the Canon Speedlite Transmitter ST-E3-RT

  • Radiofrequency 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.
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 – a direct line of sight not required.

Multiple flash photography

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

Remote camera control

Trigger an EOS camera fitted with a Canon Speedlite Transmitter ST-E3-RT from a second unit or from a compatible Speedlite flashgun, such as the Speedlite 600EX-RT. Up to 15 cameras can be triggered at once, for synchronised shooting.

Easy to use design

The Canon 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.


  • EOS 40D*
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  • EOS-1D X Mark III
  • EOS 850D
  • EOS R5
  • EOS R6
  • EOS M50 Mark II

For more Canon accessories see here.

Additional information


Delivering/Collecting Your Order

We aim to deliver your product within 3-5 working days. Should there be any delay or an issue with stock availability we will contact you asap.

If you have specific delivery/order instruction you can write these in the order notes at checkout.

Collecting Your Order:

Sometimes you’ll want something even quicker than we can deliver. That’s why we offer you the option to order online and collect in-store. Before coming in to collect please call or email us to ensure stock is available.

For more information regarding delivery please see our delivery page.

Returning your product if it’s unwanted:

Please return your item unused and in original condition (as it was received by you) with proof of purchase within 14 days, and we’ll give you an exchange or refund.

We do ask when returning to use a reputable courier with a tracking service and the item to be fully insured. Please be aware that we’ll only process your refund once the item has been returned to and checked by our specialist; this can take up to 14 days.

Returning your product because it has a fault:

If your product develops a fault within 30 days of purchase, please return with proof of purchase and we’ll exchange or refund it.

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Ask us how we can offer you more value for your money. We’re always looking for the best price, even if we’re saving a couple of pounds. That’s why we’ll make it in our best interest to offer you the very best option should you find them cheaper. Our Price Match Promise

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