Finally with the arrival of the Speedlite Transmitter ST-E3-RT, Canon has upgraded its offerings to include a radio speedlite trigger.
But, we need to back up before we go on. You need to know what does a Canon Speedlite Transmitter do.
Canon was overdue to take advantage of the superior technology of radio technology and now it's available.
One transmitter can control up to 5 groups of flashes (or 15 separate flashes) and has 8 types of custom functions. That includes controlling the light ratio in half-stop increments up to a ratio of 8 : 1.
The LCD screen with back-lighting control is a bright dot matrix display that gives you all the information you could possibly need.
You can adjust the LCD screen to 5 different levels of contrast.
You can set the background color of the screen to green or Amber if it is set as the master unit.
It has almost a 100 foot range with 360 degree coverage. This supports E-TTL II (evaluative through the lens) metering as well as manual and strobe flash.
The ST-E3-RT works with the Canon Speedlite 600EX-RT. It has all of the same control functions as a 600EX-RT, except of course the flash itself.
This photo shows you the transmitter mounted on top of a Canon 5D Mark III.
What I like about these speedlite transmitters is how light and small they are. I have had a Canon Speedlite Transmitter ST-E2 for many years now and your camera is still light and easy to handle with the transmitter attached. See my full post on the ST-E2.
I also like the fact that you can power this accessory with with two AA batteries.
The RT (Radio Transmitter) system is almost a necessity when you are shooting with speedlites inside softboxes or other similar systems where direct line-of-site is interrupted. This transmitter also has the same dust and water resistance that has been built into the Canon EOS-1D series of cameras.
You can get more insightful information about this Canon accessory by reading the Speedlite Transmitter ST-E3-RT Speedlite Manual pdf.
There are rumors that Canon will be announcing replacement flash for the IR (infrared) triggered Canon Speedlight 430EX II. with RT- Radio Transmitter control.
Stay inspired, shoot your Canon.
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