Canon ST-E3-RT Speedlite Transmitter Version 3

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ST-E3-RT Speedlite Transmitter Version 3

Remote trigger for Speedlite flash units

Sophisticated photography with external flash units is made easy with the Speedlite Transmitter ST-E3-RT (Ver.3): multiple flashes can be fired simultaneously and settings can be made remotely. For triggering synchronized multi-camera shots.

Reliable external flash trigger

Triggers compatible Canon Flash units from a distance of up to 30 meters. The 2.4 GHz radio frequency works reliably, even around corners or where objects are in the way - the radio transmission eliminates the visual contact previously required.

User-friendly design

The Speedlite Transmitter ST-E3-RT (Ver.3) is protected against dust and splash water to the same extent as the professional EOS cameras and lenses of the L series. An easy-to-read, illuminated LC display serves as a control screen, and power is supplied either via two AA AA cells or LR6 rechargeable batteries.

Working with multiple flashes

Ideal for demanding setups with multiple flash units. Up to 15 Sppedlite flash units can be triggered with one Speedlite Transmitter ST-E3-RT (Ver.3) mounted on a camera. E-TTL II flash value metering ensures simple exposure control.

Wireless synchronization to the second shutter curtain (4)

The Speedlite Transmitter ST-E3-RT (Ver.3) supports synchronization to the second shutter curtain, light output reduced to 1/8,192 and flash exposure memory (FE Memory) when using a Speedlite EL-1/EL-5 externally.

Remote camera triggering

An EOS camera (3) equipped with a Speedlite transmitter can be remotely triggered by another camera with such a transmitter or a compatible Speedlite, such as the Speedlite 600EX-RT. Up to 15 cameras can be triggered together in this way.

1. Unless otherwise stated, all specifications are based on the standard test procedures of Canon.
2. Specifications are subject to change without notice.
3. Remote triggering from the receiver and the receiver function for linked shooting are not available when the Speedlite Transmitter ST-E3-RT (Ver.3) is used with cameras equipped with an N3 remote control terminal and compatible with the E-TTL II/E-TTL auto flash system released in 2011 or earlier.
4. With supported cameras from model year 2020 onwards, e.g. EOS-1D X Mark III, EOS R5/R6 and newer models, but not EOS 850D.