Canon ST-E3-RT Speedlite Transmitter

Model: 5743B002

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Canon 5743b002 1
Canon 5743b002 1
Canon 5743b002 2
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General Information

Type Radio transmissions wireless Speedlite transmitter
Transmission Range Approx. 98.4 ft. (30m)
Flash Control Ratio control: 1:8 - 1:1 - 8:1, power 1/2-stop increments
Coverage Flash coverage: Transmission Angle: 360° all around
Power Source 2x AA/LRG Alkaline Batteries (Ni-MH and Lithium batteries can also be used)
Battery Life: Approx. 10 hours continuously when using AA/LR6 alkaline batteries (At a room temperature of 73°F/+23°C).
Dimensions 2.65 x 2.42 x 3.05" (67.4 x 61.5 x 77.4 mm)
Weight 3.9 oz (110 g) excluding battery
Expert Reviews
The digital picture.34755376
30 January 2014

Take only what is necessary for radio wireless remote flash and camera control out of the Canon Speedlite 600EX-RT Flash , and what you have left is the Canon Speedlite Transmitter ST-E3-RT.

User Reviews
B h photo.32817553
22 May 2017

This transmitter, combined with 600EX, 600EX II, or 430EX III Speedlites makes setting up lighting (from simple to complex) a snap. It's so easy to setup the various groups (from ETTL to Manual to ratios to on/off) right from the back of the camera that you become inspired to try more creative...

29 April 2014

I used the ST-E3-RT with 3 600EX-RT flashes for a wedding reception and loved the ease of the system and the results -- that is, when I could focus.There is no focus assist beam when the radio trigger is on-camera, so as soon as it gets dark, focus performance diminishes significantly.

  • +

    Superior build quality

  • -

    no focus assist

B h photo.32817553
22 July 2017

Expensive, but overall a wonderful product. When coupled with a few Canon speedlites, the only limitation is your imagination. The set up and control are easy and user friendly. It is small and only about 3 oz (much better than have a full sized 600EX or even 430EX on top of your camera).

B h photo.32817553
18 June 2017

Easy to use and set-up and a perfect way to get the lighting effects you want.

B h photo.32817553
16 June 2017

A must have if you need off camera flash features. Works as advertised. Easy to use. ETTL works great.

B h photo.32817553
16 June 2017


B h photo.32817553
7 June 2017

This transmitter, together with the 600EX II speedlite, is a match made in heaven. Easy to setup and use. Love that it is RF. It is a bit pricey, but definitely worth it.

B h photo.32817553
26 May 2017

This transmitter is awesome. Love that it is radio.

B h photo.32817553
7 May 2017

Easy to set quickly right out of the box.

B h photo.32817553
20 April 2017

If you own the newest Canon Speedlite off camera this is the unit to get. RF is much more reliable than IR and doesn't not rely on light of sight like the older versions of the transmitter. Yes it is pricey but worth it in terms of convenience and dependability.

Product Highlights
  • Facilitates Wireless Transmission
  • 5 Groups or 15 Individual Speedlites
  • Range Up to 98.4'
  • Makes Complex Lighting Setups Simple
  • Compact Design & Reliable Construction
  • Clearly Laid Out Information Panel
  • Buttons With Back Lighting
In The Box
  • Canon ST-E3-RT Speedlite Transmitter
  • Soft Case
  • 1-Year Limited Warranty
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