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Canon 2478A002 ST-E2 Speedlite Transmitter — main product image
Canon

Canon 2478A002 ST-E2 Speedlite Transmitter

★★★★★4.1 (106 reviews)

Unleash Wireless Flash ControlIntroducing the Canon ST-E2 Speedlite Transmitter, a dedicated clip-on transmitter designed for E-TTL/E-TTL II wireless flash systems. Gain seamless control over your Canon Speedlites for professional lighting setups. Compatibility: Supports Canon 580EX II, 430EX, ...

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Overview

Unleash Wireless Flash Control

Introducing the Canon ST-E2 Speedlite Transmitter, a dedicated clip-on transmitter designed for E-TTL/E-TTL II wireless flash systems. Gain seamless control over your Canon Speedlites for professional lighting setups.

  • Compatibility: Supports Canon 580EX II, 430EX, and 430EX II Speedlites.
  • Wireless Control: Controls an unlimited number of flashes in two separate groups (A and B).
  • Flash Ratio: Adjustable flash output ratio between groups A and B (8:1 to 1:1 or 1:1 to 1:8).
  • AF Assist Beam: Emits an AF assist beam for improved focusing in low light conditions, linked to the EOS 3's 45 focusing points.
  • EOS Camera Compatibility: Compatible with Type A EOS cameras (E-TTL, auto flash) and Type B EOS cameras (manual flash).

Key Features

Wireless flash controller for the Canon 420EX and 550EX and other Canon flashes.

Indoor transmission range of approximately 40 to 50 feet

Outdoor transmission range of approximately 26 to 33 feet

1,500-transmission battery life

Turns off after 90-second idle

Specifications

Function
Wireless flash controller
Indoor Transmission Range
40 to 50 feet (approximately)
Outdoor Transmission Range
26 to 33 feet (approximately)
Battery Life
1,500 transmissions
Auto-Off Feature
Yes, after 90-second idle
Compatible Flashes
Canon 420EX, 550EX, other Canon flashes

Pros & Cons

👍 Pros

  • Enables wireless control of Canon 420EX, 550EX, and other compatible Canon flashes, enhancing creative lighting setups.
  • Offers an indoor transmission range of approximately 40 to 50 feet, suitable for various studio or interior shooting environments.
  • Provides an outdoor transmission range of approximately 26 to 33 feet, allowing for off-camera flash use in outdoor settings.
  • Features an impressive 1,500-transmission battery life, ensuring extended operational time during shoots.
  • Includes an auto-off function after 90 seconds of idle time, conserving battery life when not actively in use.

👎 Cons

  • Compatibility is limited to specific Canon Speedlite models (420EX, 550EX) and "other Canon flashes," which may require verification for newer models.
  • The listed transmission ranges are approximate, and actual performance can vary based on environmental factors and line of sight.
  • Does not include any manual power control or ratio settings directly on the transmitter, relying on the flashes themselves for adjustments.
  • Requires batteries, which are not specified in type or included, potentially incurring additional costs and preparation.
  • Lacks a visual display for settings or confirmation, which could make adjustments less intuitive compared to more advanced controllers.

Frequently Asked Questions

The Canon ST-E2 Speedlite Transmitter is a wireless flash controller for the Canon 420EX, 550EX, and other compatible Canon flashes.
The indoor transmission range for the Canon ST-E2 Speedlite Transmitter is approximately 40 to 50 feet.
The ST-E2 Speedlite Transmitter offers a battery life of 1,500 transmissions.
Yes, it turns off automatically after 90 seconds of idle time to conserve battery.
The outdoor transmission range is approximately 26 to 33 feet.
The product description states it is a wireless flash controller but does not specify direct power control features on the unit itself.

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