Canon

Canon STE3RT Speedlite Transmitter for Wireless Flash

4.6 (635 reviews)

Unleash Wireless Flash ControlThe Canon Speedlite Transmitter ST-E3-RT revolutionizes wireless flash photography, using 2-way radio wave communication for enhanced communication between master and slave units. Achieve precise lighting control with a transmission distance of up to 98.4' (30m) at a...

$189.95*
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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

Unleash Wireless Flash Control

The Canon Speedlite Transmitter ST-E3-RT revolutionizes wireless flash photography, using 2-way radio wave communication for enhanced communication between master and slave units. Achieve precise lighting control with a transmission distance of up to 98.4' (30m) at a 360-degree angle.

  • Communication: 2-way radio wave
  • Transmission Distance: Up to 98.4' (30 m)
  • Control: Up to 5 groups or 15 individual flashes
  • Flash Support: E-TTL II, manual, stroboscopic, auto external metering
  • Display: Dot matrix LCD with backlit control panel
  • Custom Functions: 8 types
  • Personal Functions: 3 types

Key Features

Newly designed wireless system uses 2-way radio wave communication for enhanced communication among master and slave units.

Achieves a transmission distance of up to 98.4 ft. / 30m, all at a 360 degree angle.

Up to 5 groups, or 15 individual flashes can be controlled via 1 transmitter; 8 types of custom functions, 3 types of personal functions.

Supports E-TTL II flash, manual flash, strobe and external flash metering.

Dot matrix LCD panel displays all pertinent information simultaneously and backlit control panel means easy operation. It even features an internal sound emitter.

Specifications

Wireless System
2-way radio wave communication
Transmission Distance
Up to 98.4 ft. / 30m
Transmission Angle
360 degrees
Control Groups
Up to 5 groups
Individual Flash Control
Up to 15 individual flashes
Custom Functions
8 types
Personal Functions
3 types
Supported Flash Modes
E-TTL II flash, manual flash, strobe, external flash metering
Display Panel
Dot matrix LCD
Control Panel
Backlit
Sound Emitter
Internal

Pros & Cons

👍 Pros

  • Utilizes a newly designed 2-way radio wave communication system, enhancing communication among flash units.
  • Achieves an impressive transmission distance of up to 98.4 ft. (30m) with 360-degree coverage, offering great flexibility.
  • Capable of controlling up to 5 groups or 15 individual flashes, providing extensive creative control over lighting setups.
  • Supports a comprehensive range of flash modes including E-TTL II, manual, strobe, and external flash metering.
  • Features a clear dot matrix LCD panel that displays all pertinent information simultaneously, improving operational ease.

👎 Cons

  • Requires other compatible flash units for its wireless control capabilities to be fully utilized.
  • The internal sound emitter, while a feature, might not be desired by all users in every shooting environment.
  • Transmission distance of 98.4 ft. (30m) is stated as effective, but actual range can vary based on environmental interference.
  • While it supports multiple flash modes, specific advanced features for each mode are not detailed.
  • The transmitter controls other flashes but is not itself a light source, requiring additional equipment for illumination.

Frequently Asked Questions

The Canon STE3RT transmitter can achieve a transmission distance of up to 98.4 feet (30 meters), offering 360-degree coverage for wireless flash communication.
This speedlite transmitter utilizes a newly designed 2-way radio wave communication system for enhanced communication between master and slave units.
The Canon STE3RT can control up to 5 groups or 15 individual flashes, providing extensive flexibility for complex lighting setups.
It supports E-TTL II flash, manual flash, stroboscopic flash, and external flash metering, offering versatility for different photographic needs.
Yes, it features a dot matrix LCD panel that displays all pertinent information simultaneously, and the control panel is backlit for easy operation in various lighting conditions.