The Speedlite Transmitter ST-E3-RT (Ver.2) provides some much-anticipated upgrades from professionals to make it an even more appealing resource for flash photography when used with the Speedlite EL-1. This updated version allows for wireless rear curtain synchronization to capture ambient light trails and convey a sense of speed for moving subjects. The expansive minimum output range (down to 1/8192 power) gives you increased opportunity for creativity over the flash output from brightest to dimmest. And you now have FE Memory as part of the radio transmitter, so you can lock-in an E-TTL flash exposure level, even in complex multi-flash set-ups, and continue to use it for the same scene or subject. These improvements combine with the previous benefits of its predecessor including radio-controlled, two-way wireless transmission up to 98.4 ft., among up to five groups or fifteen individual Speedlites, a dot-matrix LCD with backlighting, intuitive controls, and more.

Wireless Rear Curtain Synchronization

When used in combination with the Speedlite EL-1, the Speedlite Transmitter ST-E3-RT (Ver.2) provides additional benefits of wireless rear curtain synchronization so the flash fires as the shutter closes to capture beautiful light trails to signify the movement of the subject, minimum flash power as low as 1/8192 for even more opportunity to work in low available light, and FE memory so you can store an E-TTL flash exposure and continue to use that same exposure when subjects and scenes remain unchanged.

Reliable and Robust Connection

The Speedlite Transmitter ST-E3-RT (Ver.2) facilitates radio-controlled, two-way wireless transmission up to 98.4 feet, for a reliable and robust connection among sender and receiver units. Communicating on 2.4 GHz frequencies, the ST-E3-RT (Ver.2) does not have the same directional limitations of traditional wireless optical transmitters. Where other wireless signals can be interrupted by physical obstacles, radio controlled systems excel. Fifteen transmission channels are available, selectable manually or automatically (for optimum radio transmission, depending on environment), and radio transmission IDs can be set to prevent interference from other photographers on the same channel. With the extended, more reliable range afforded by radio transmission, ambitious photography is made easier

Control Up to 5 Groups or 15 Individual Flashes

With the Speedlite Transmitter ST-E3-RT (Ver.2), up to 15 Canon RT-compatible Speedlites in five groups can be controlled from the camera, via a single transmitter. Each group can be set to a different flash mode, enabling multiple configurations for creative photography. For example, with the ST-E3-RT (Ver.2) some flashes can be directed to operate according to the camera’s E-TTL flash reading, others can be set manually; groups can be set to overexposure or underexpose, and much, much more. With up to 15 flashes under the control of one transmitter, wirelessly, complex lighting setups normally reserved for the studio are a breeze.

Dot Matrix LCD Panel

The Speedlite Transmitter ST-E3-RT (Ver.2) features a dot-matrix LCD panel (172 x 104 dots). This LCD displays Flash status, flash settings and wireless configuration for any combination of Speedlite EL-1, 600EX-RT series, and 430EX-RT, used off-camera as Receiver units. With the transmitter’s LCD screen combined with backlit operation buttons and even an internal sound emitter, the ST-E3-RT (Ver.2) is as easy to operate in the dark as in daylight.