Canon Speedlite Transmitter ST-E3-RT (Version 3)

The Canon Speedlite Transmitter ST-E3-RT (Version 3) is your gateway to professional wireless flash photography. Mount it on your camera and instantly unlock creative multi-flash lighting setups with reliable radio frequency control that works up to 30 metres away — even around corners and without direct line of sight.

Fire and control up to 15 compatible Speedlite flashguns simultaneously, or trigger up to 15 cameras at once for perfectly synchronised shooting. The intuitive back-lit LCD screen and E-TTL II integration make exposure control straightforward, whilst advanced features like wireless second curtain sync, 1/8192 nuance lighting, and flash exposure memory give you the creative freedom to push your photography further.

Built to professional standards, the ST-E3-RT (Ver 3) is weather sealed against dust and moisture, features a metal mounting foot for durability, and runs on just two AA batteries. Whether you’re setting up complex studio lighting or coordinating multiple cameras on location, this transmitter makes sophisticated remote flash photography accessible and reliable.

• Radio frequency triggering works reliably up to 30 metres indoors and outdoors
• Control up to 15 Speedlite flashguns or 15 cameras with a single transmitter
• E-TTL II metering for automatic exposure control
• Wireless second curtain sync support for Speedlite EL-1 and EL-5
• Weather sealed construction for durability in any conditions
• Eight custom functions for personalised control