The Canon Speedlite Transmitter ST-E3-RT (Ver.3) is a sophisticated tool designed for photographers seeking advanced wireless flash control. Building upon its predecessors, this version introduces enhanced features to improve lighting setups and creative possibilities.

Key Features:

• Wireless Rear Curtain Synchronization: This feature allows for rear curtain sync in wireless setups, enabling creative effects such as light trails behind moving subjects.
• Enhanced Flash Control: The transmitter supports E-TTL II, manual flash, stroboscopic, and auto external flash metering, providing flexibility in various shooting scenarios.
• Comprehensive Flash Management: Capable of controlling up to five groups or 15 individual Speedlites within a range of approximately 98.4 feet (30 meters), offering extensive lighting control for complex setups.
• User-Friendly Interface: Equipped with a dot matrix LCD panel that displays pertinent information simultaneously, and backlit controls for easy operation in low-light conditions.
• Customizable Settings: Includes eight types of custom functions and three types of personal functions, allowing photographers to tailor the transmitter to their specific needs.

Specifications:

• Transmission Type: Radio transmission
• Transmission Range: Approximately 98.4 feet / 30 meters
• Channels: 15
• Groups: 5
• Power Source: Two AA batteries
• Dimensions: Approx. 2.7 x 2.4 x 3.1 inches (67 x 62 x 77 mm)
• Weight: Approx. 3.9 oz (110g) (excluding batteries)

The ST-E3-RT (Ver.3) is compatible with Canon cameras featuring a standard hot shoe. However, it is not compatible with cameras equipped with a multi-function shoe.