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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 98.4ft 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 out.

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 AF assist & no infrared signal, it’s still a wonderful step forward. If you’re using 600EX-RT Speedlites off-camera, you want this trigger.

One quick rant, because just looking at the picture doesn’t tell you this. The display screen and controls are on the top of the transmitter, which isn’t too big a deal. Just tilt the transmitter, because Canon was smart enough to make it pivot. WRONG! There is no pivot! Full control of off camera Speedlites is possible using the improved screen and button layout, but quick adjustments must be done by lowering the camera to waist-level to see the screen. Why Canon, why? It’s not a deal breaker by any means, but you will notice this omission.

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