Canon Speedlite Transmitter ST-E3-RT

Elevate your lighting creativity with the Canon Speedlite Transmitter ST-E3-RT. Moving beyond the limitations of traditional line-of-sight optical systems, this transmitter utilizes a reliable 2.4 GHz radio frequency to communicate with your flashes. This provides a robust and dependable connection over a range of up to 30 meters, working around obstacles and performing flawlessly even in bright outdoor conditions where optical systems might fail. It’s the command center for professional photographers who demand precise control over their lighting.

The ST-E3-RT allows you to wirelessly control up to 15 individual Canon RT-series Speedlites, arranged in up to 5 separate groups. From the large, illuminated LCD panel on the back of the transmitter, you can adjust modes (E-TTL II / Manual), power levels, and custom functions for each group independently. Its design mirrors the control panel of a high-end Speedlite, making it instantly familiar and intuitive to use. With a weather-sealed construction matching that of professional EOS cameras and L-series lenses, the ST-E3-RT is built to be a reliable workhorse for any lighting scenario.

Technical Specifications:

Model: Speedlite Transmitter ST-E3-RT

System Type: 2.4 GHz Radio Frequency Wireless Flash Control

Transmission Range: Approx. 30 m / 98.4 ft

Channels: 15

Wireless Radio ID: 0000-9999

Groups: 5 (A, B, C, D, E)

Compatible Flashes: Canon Speedlites with RT function (e.g., EL-1, EL-5, 600EX-RT series, 430EX III-RT)

Flash Control: E-TTL II / E-TTL Autoflash, Manual flash, Stroboscopic flash, Auto external flash metering

Power Source: 2 x AA alkaline or Ni-MH batteries

Construction: Dust and water resistant sealing

Dimensions (W x H x D): Approx. 67.4 mm x 61.5 mm x 77.4 mm

Weight: Approx. 110 g (without batteries)