Canon Speedlite Transmitter ST-E3-RT

Canon Speedlite Transmitter ST-E3-RT

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.


The ST-E3-RT uses 2-way wireless radio for improved communication among the master (sending) Canon Speedlite flash and slave (receiving) Speedlite flash units up to 98.4 feet. This enables you to use one or more flashed for more flattering lighting.


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.



Canon Speedlite Transmitter ST-E3-RT specs

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.



cover of Canon Speedlite Transmitter ST-E3-RT Manual


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.

Author Bruce Lovelace
Bruce Lovelace Signature

Bruce Lovelace is the publisher of Canon Camera Geek. Read more about him on the About Page. He also publishes how to articles and camera gear reviews at the Photography Tips website.

View some of Bruce's photos on Instagram  and Flickr  Join the tribe of followers on YouTube. Bruce also runs photo workshops and provides 1 on 1 digital photography coaching.

Canon Geek on Google My Business

You might like these

Please consider using one of the retailers below when you make your purchase.  It helps me keep the Canon Geek site going and it cost you NOTHING.



Search for articles on this Site:


Recent Articles

  1. What's the RF 24-105mm Lens Good For. Guide on the Canon RF 24-105

    May 27, 24 04:34 PM

    RF 24-105mm Macro
    It's one of Canon's most versatile all-purpose lenses, but specifically what is the RF 24-105mm lens good for. 11 recommended ways to use the RF 24-105.

    Read More

  2. Photos From My Own Canon R6 Mark II High ISO Test. Surprising Results

    May 23, 24 11:33 AM

    ISO 40,000 example
    R6 M2 high resolution, high ISO sample photos. Will this full frame mirrorless camera give you high ISO performance? Canon R6 Mark II High ISO Test. shocked!

    Read More

  3. Best Lenses For Canon R6 Mark II Advantages and disadvantages of them

    May 23, 24 11:00 AM

    Canon R6 Mark II lens recommendation header
    The camera is great, but waht about the best lenses for your Canon R6 Mark II? Here's what I recommend.

    Read More

  4. What is the Canon 100-400 Lens Good For And Is it Worth The Money

    May 03, 24 12:10 PM

    Canon 100-400 lens header
    You're considering adding a zoom telephoto lens to your camera bag. Do you need one for what you want to photograph?? What is the Canon 100-400 Lens Good For

    Read More

  5. Canon 50mm Lenses-Simple Comparison of EF 50mm f/1.2 vs. F/1.4 vs. f/2

    Apr 25, 24 09:54 AM

    Canon 50mm portrait sample
    Which one is best for you? Here is a simplified comparison of the various Canon 50mm lenses, an interesting accessory for the serious digital photographer

    Read More

  6. Ditch the Default: Top Alternatives to the Canon 17-40 Lens

    Apr 25, 24 09:43 AM

    17-40 lens alternative Tamron
    Not sure about investing in a Canon EF17-40mm L lens? It's a great lens, but is it worth it? What is the best choice for a good Canon 17-40 alternative?

    Read More


Sign up for a monthly update

Enter Your E-mail Address
Enter Your First Name
Then

Don't worry — your e-mail address is totally secure.
I promise to use it only to send you Canon Geek Newsletter.


Best Accessory for 580EX II

Speedlite Transmitter ST-E2