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Canon Speedlite Transmitter ST-E3-RT, compact hot-shoe unit with dot-matrix LCD and backlit controls

Canon

Canon Speedlite Transmitter ST-E3-RT Ver. 3 camera accessory

SKU CH-VNNS-GEGXQ

Radio transmitter controls up to fifteen Canon Speedlites in five groups at 98.4 feet with 1/8192 power output and FE memory

  • TypeAccessory
  • Radio-controlled wireless transmission up to 98.4 feet for flexible off-camera flash positioning
  • Controls up to five groups or fifteen individual Speedlites from a single transmitter
  • Minimum flash output down to 1/8192 power for precise low-light control
  • FE Memory locks in E-TTL exposure level for consistent results in complex multi-flash setups
  • Wireless rear curtain sync captures ambient light trails to convey motion in moving subjects

Flash transmitter for Canon DSLRs

The Canon Speedlite Transmitter ST-E3-RT Version 3 mounts on a standard hot shoe and provides radio-controlled, two-way wireless flash control. It is designed for photographers who use Canon DSLRs and want to manage multiple Speedlites from the camera. It is not compatible with cameras that use a multi-function shoe, so buyers with those bodies cannot use this transmitter.

Wireless range and group limits

Radio transmission reaches up to 98.4 feet and supports up to five groups or fifteen individual Speedlites. The dot matrix LCD with backlighting shows settings clearly, and intuitive controls let you adjust groups and power levels directly on the transmitter. These are the practical limits of the wireless system; no longer range or larger group counts are available with this unit.

Minimum flash output granularity

The transmitter can set flash power down to 1/8192, giving very fine control over fill light in dark scenes. FE Memory locks an E-TTL exposure value so you can reuse it across a complex multi-flash setup without re-metering. This precision is the specification that determines whether the unit meets your low-light and repeatability needs.

Highlights

  • Radio-controlled wireless transmission up to 98.4 feet for flexible off-camera flash positioning
  • Controls up to five groups or fifteen individual Speedlites from a single transmitter
  • Minimum flash output down to 1/8192 power for precise low-light control
  • FE Memory locks in E-TTL exposure level for consistent results in complex multi-flash setups
  • Wireless rear curtain sync captures ambient light trails to convey motion in moving subjects

Specifications

TypeAccessory

Questions about this item

How many Speedlite groups and individual units can this transmitter control?

The ST-E3-RT Ver. 3 manages up to five groups or fifteen individual Canon RT-compatible Speedlites from a single camera-mounted transmitter.

What does the 1/8192 minimum power setting mean for flash output?

It lets you dial flash output down to an extremely low level, useful for subtle fill or wide-aperture work in bright conditions without overpowering ambient light.

What is the practical range of the 98.4 ft radio link?

The two-way radio signal reaches up to 98.4 feet, allowing reliable off-camera flash control around large venues or outdoor locations without line-of-sight limits.

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