Canon st e3 rt

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Canon ST-E3-RT Speedlite Transmitter

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The Canon ST-E3-RT Speedlite Transmitter

The ST-E3-RT Speedlite Transmitter is Canon’s first wireless transmitter based on radio-signal technology. It gives users the flexibility of line-of-sight-free shooting when coupled with the Canon Speedlite 600EX-RT. With a range of 98.4 ft and the ability to adjust not only ratios but actual power settings from the transmitter itself, the ST-E3-RT greatly simplifies elaborate lighting setups.

The ST-E3 features a detailed LCD display screen with clearly laid-out, backlit buttons for full control of settings. Since the transmitter uses a radio signal, it’s only compatible with the radio-signal based 600EX-RT. Despite this, the ST-E3-RT transmitter still offers more control of its compatible Speedlite than any other trigger system available.

Tim's Take

The ST-E3-RT transmitter gives Canon the upper hand in the world of off-camera flash shooting. It eliminates the need for multiple accessories just to make your flash work off-camera. While I do have a few big gripes with it, like the lack of both AF-assist and infrared signal, it’s still a wonderful step forward. If you’re using 600EX-RT Speedlites off-camera, you want this trigger.

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