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Canon Speedlite Transmitter ST-E3-RT 5743B002AA
$349.49 $470.00 Save 26%
Code: CA-DA-5743B002AA
MPN: 5743B002AA
UPC: 013803142488
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Canon SpeedLite Transmitter ST-E3-RT Product Info

Canon Speedlite Transmitter for Wireless Flashes ST-E3-RT connects sophisticated flash setups with ease, and lets you trigger all your flashes remotely at distances up to 98.4 feet. Connect up to fifteen Speedlite flashes in up to five groups and trigger them with 2-way wireless signals with the Canon Speedlite Wireless Transmitter. This wireless flash transmitter makes operating complex setups easy, thanks to a clearly laid-out information panel, back-lit buttons, and a host of other features. The Canon SpeedLight Transmitter is the next generation of wireless flash control systems!

Canon 5743B002AA: Speedlite Transmitter ST-E3-RT

Specifications for Canon Wireless Flash Transmitter:



Radio transmissions wireless Speedlite transmitter

Compatible Cameras

Type A EOS cameras (E-TTL II/E-TTL autoflash)

Sync Speed

High-Speed Sync provided (EOS-1D X and EOS 5D Mark III only)

Flash Exposure Confirmation

Flash exposure confirmation lamp lights in green

* If it does not light, shooting is not performed with the standard exposure

AF Assist Beam


Wireless Functions

Transmission System

Radio Transmission

Transmission Range

Approx. 98.4 ft. (30m)

Flash Ratio Control

1:8 - 1:1 - 8:1, power 1/2-stop increments

Flash Coverage

Transmission Angle: 360° all around

Slave Operation Confirmation

Green Light

Lit: Radio Transmissions Okay

Red Light

Lit: Not Connected

Blinking: Transmission Error/ Too many units (Master units + slave units = more than 16 units)

Orange Light

Lit: Sub-master transmission

Blinking: Receiving remote release shooting, linked shooting signal

Slave Unit SE Mode Cancellation

The test flash button can be pressed to test if the slave units fire or cancel the auto power off status.


Power Source

AA/LRG Alkaline Batteries x2 (Ni-MH and Lithium batteries can also be used)

Battery Life: Approx. 10 hours continuously *When using AA/LR6 alkaline batteries used (At a room temperature +23°C/73°F).

SE Mode

Power off after 5 min. of idle operation


2.65 (W) x 2.42 (H) x 3.05 (D) in. / 67.4 (W) x 61.5 (H) x 77.4 (D) mm


3.9 oz. / 110g (excluding battery)

Features of Canon Wireless Radio Transmitter for Flash Controls:

  • Newly-designed wireless system uses 2-way radio wave communication for enhanced communication among master and slave units. Achieves a transmission distance of up to 98.4 ft./30 m, all at a 360 degree angle.
  • Up to 5 groups, or 15 individual flashes can be controlled via 1 transmitter.
  • Supports E-TTL II flash, manual flash, stroboscopic and auto external flash metering.
  • Dot matrix LCD panel displays all pertinent information simultaneously and backlit control panel means easy operation.
  • 8 types of custom functions, 3 types of personal functions.
  • Improved hot shoe contacts for more reliable information transmission and operation; compact design is approx. 2.65 (w) x 2.42 (H) x 3.05 (D) in.

Package Contents:

  • Canon Speedlite Wireless Flash Transmitter

Canon SpeedLite Transmitter ST-E3-RT Comments