PRODUCT OVERVIEW
The Canon Remote Flash Control Transmitter ST-E3-RT provides full support of Canon’s new radio-based wireless flash technology and can control up to five groups of flashes, up to 100 feet (30m) away

The ST-E3-RT makes complex lighting setups simple by facilitating radio-controlled, two-way wireless transmission up to 30m away, among up to five groups or fifteen individual Speedlites. It has controls similar to the new Speedlite 600EX-RT, including multiple flash metering options, and a variety of flash modes. Compact design with highly reliable construction combined with a clearly laid-out information panel and buttons with back lighting make this an indispensible tool for advanced professional flash photography. The ST-E3-RT represents the next generation in wireless flash systems. Newly-designed wireless system uses 2-way radio wave communication for enhanced communication among master and slave units. Achieves a transmission angle of 360 degrees.

Key Features
– Facilitates Wireless Transmission
– 5 Groups or 15 Individual Speedlites
– Range Up to 30m
– Makes Complex Lighting Setups Simple
– Compact Design & Reliable Construction
– Clear Dot matrix LCD Information Panel
– Buttons With Back Lighting
– 8 types of custom functions, 3 types of personal functions
– Supports E-TTL II flash, manual flash, stroboscopic and auto external flash metering
– Improved hot shoe contacts for reliable information transmission and operation

Slave operation confirmation information
– Green Light on: Radio Transmissions Okay
– Red Light on: Not Connected
– Blinking: Transmission Error/ Too many units (Master units + slave units = more than 16 units)
– Orange Light on: Sub-master transmission
– Blinking: Receiving remote release shooting, linked shooting signal

Please Note: Because it does not have an optical transmission function, the Speedlite Transmitter ST-E3-RT is not compatible with earlier Speedlite models such as 580EX II.

Specifications
Type: Radio transmissions wireless Speedlite transmitter
Transmission Range Approx: 30m
Flash Control: Ratio control: 1:8 – 1:1 – 8:1, power 1/2-stop increments
Coverage: Flash coverage: Transmission Angle: 360° all around
Power Source: 2x AA/LRG Alkaline Batteries (Ni-MH and Lithium batteries can also be used)
Battery Life: Approx. 10 hours continuously when using AA/LR6 alkaline batteries (At a room temperature of 73°F/+23°C).
Dimensions: 67.4 x 61.5 x 77.4 mm
Weight: 110 g excluding battery