Canon Speedlite Transmitter ST-E3-RT (Version 2)

SKU: 5743B012

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Canon Speedlite Transmitter ST-E3-RT (Version 2)

  • Canon Speedlite Transmitter ST-E3-RT (Version 2)
  • Soft Case
  • Warranty Card (USA/CA)

From The Wavelength Blog Read more

Canon Speedlite Transmitter ST-E3-RT (Version 2)

Featuring some much-anticipated upgrades from professionals, the Speedlite Transmitter ST-E3-RT (Version 2) from Canon makes it an appealing and a must-have resource for flash photography when using the Speedlite EL-1. This updated version of the transmitter combines the amazing features of its predecessor including radio-controlled, two-way wireless transmission up to 98.4-feet, among up to five groups or 15 individual Speedlites, a dot-matrix LCD with backlighting, intuitive controls, and more with features like wireless rear curtain synchronization, minimum output range of 1/8192 FE Memory and more.

Much-Anticipated Upgrades

This updated transmitter allows for wireless rear curtain synchronization capturing ambient light trails and convey a sense of speed for moving subjects. The flash fires as the shutter closes to capture beautiful light trails to signify the movement of the subject. The minimum output range of 1/8192 helps you expand your creativity over the flash output. Thanks to the FE Memory, you can lock-in an E-TTL flash exposure level, even in complex multi-flash set-ups, and continue to use it for the same scene or subject.

Reliable and Robust Connection

Offering a reliable and robust connection among sender and receiver units, the ST-E3-RT (Ver.2) facilitates radio-controlled, two-way wireless transmission up to 98.4 feet. This transmitter communicates on 2.4 GHz frequencies without the same directional limitations of traditional wireless optical transmitters. There are 15 transmission channels that are available, selectable manually or automatically for optimum radio transmission, depending on environment. The radio transmission IDs can be set to prevent interference from other photographers on the same channel. The extended, more reliable range afforded by radio transmission, ambitious photography is made easier.

Control Up to 5 Groups or 15 Individual Flashes

Control up to 15 Canon RT-compatible Speedlites in 5 groups from your camera using a single transmitter. Each of these five groups can be set to a different flash mode, enabling multiple configurations for creative photography. With the ST-E3-RT (Ver.2), you can direct some flashes to operate according to the camera’s E-TTL flash reading while others can be set manually. These groups can also be set to overexposure or underexpose, and much, much more. With up to 15 flashes under the control of one transmitter, expanding your creativity and controlling complex lighting setups is easier than ever.

Backlit Dot Matrix LCD Panel

The Speedlite Transmitter ST-E3-RT (Ver.2) is equipped with a 172 x 104 dots matrix LCD panel that displays all pertinent information such as Flash status, flash settings, and wireless configuration for any combination of Speedlite EL-1, 600EX-RT series, and 430EX-RT, used off-camera as Receiver units simultaneously. Thanks to the included backlit operation buttons and even an internal sound emitter, this ST-E3-RT (Ver.2) is as easy to operate in the dark as in the daylight.

Custom and Personal Functions

Different shooting situations demand a variety of functions. To accommodate the demands of a number of shooting situations, this Speedlite Transmitter can be configured with eight different Custom Functions and any of the three Personal Functions. The custom functions include auto power-off, modeling flash controls, sound, illumination, and more while the personal functions include display contrast and LCD panel illumination color for both sender and receiver flashes.

Built for the Extremes

Featuring a dust and water-resistant design, this compact and lightweight transmitter is built to the standards one would expect from professional Canon camera systems. All the moving parts and areas surrounding the transmitter’s display and buttons are sealed for uninterrupted performance in harsh conditions. The hot shoe contact ensures reliable communication between the camera and transmitter while the dust and water-resistant design for the mounting foot creates a dust and water-resistant seal between camera and flash.


Battery TypeAA Alkaline or Lithium


Weight3.9 oz. / 110g (excluding battery)

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