Canon Speedlite Transmitter ST-E3-RT (5743B003)
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Canon Speedlite Transmitter ST-E3-RT (5743B003)


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  • 14 Days Easy Returns
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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.

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 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-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.

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.


EOS 40D*EOS 5DSEOS M6*EOS-1D Mark II*EOS 350D*EOS 5D Mark II*EOS 760D*EOS M5*EOS-1D Mark IV*EOS 1200D*EOS 300D*EOS 5D Mark IIIEOS 600D*EOS 77DEOS 7D*EOS 7D IIEOS 80DEOS D60*EOS 4000D*EOS-1D Mark III*EOS-1Ds Mark III*EOS 100D*EOS 1100D*EOS 200DEOS 450D*EOS 60D*EOS 700D*EOS 750D*EOS-1D XEOS-1Ds Mark II*EOS M50*EOS 30D*EOS 500D*EOS 650DEOS-1D X Mark IIEOS-1D CEOS 20D*EOS 400D*EOS 50D*EOS 550DEOS 5DS REOS M2*EOS M3*EOS REOS 250DEOS 1300D*EOS 60Da*EOS 6D*EOS 6D Mark IIEOS M*EOS 2000D*EOS 5D Mark IVEOS D30*EOS 70DEOS 800D*EOS 10D*EOS M10*EOS 5D*PowerShot G5 XPowerShot G3 XPowerShot G1 X Mark IIIEOS RPEOS 90DEOS M6 Mark IIEOS RaEOS-1D X Mark IIIEOS 850DEOS R5EOS R6

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.

Price Promise:

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

  • We only price match against websites from retailers in the UK
  • The product on our competitor’s site needs to be exactly the same as the one on our site
  • The product must be in stock with the competitor and available for delivery within 10 days
  • We don’t price match against other trade sites
  • Unfortunately, we can’t price match if you’re using a finance plan.
  • We may not able to price match the item but there are other ways we can bring better value to your potential purchase.

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If you are approved you can complete your purchase immediately Representative example: Representative 19.9% APR (variable); Purchase rate 19.9% p.a. (variable); Assumed credit limit £1200. Subject to Status. PayPal Credit is a trading name of PayPal (Europe) S.à.r.l. et Cie, S.C.A., 22-24 Boulevard Royal L-2449, Luxembourg.