Questions? Call Us:

Canon ST-E3-RT
Speedlite Flash Transmitter


For sophisticated wireless flash setups, there's nothing like the new Speedlite Transmitter ST-E3-RT*.
Learn More
Our Price: $360.36
List Price: $470.00
You save 23%!
Write the first review.
Canon ST-E3-RT
Usually ships in 7-14 business days.
Need it sooner? Call us!

Related Products

For sophisticated wireless flash setups, there's nothing like the new Speedlite Transmitter ST-E3-RT*. Facilitating radio controlled, two-way wireless transmission up to 98.4 feet, among up to five groups or fifteen individual Speedlites, the ST-E3-RT represents the next generation in wireless flash systems. With operational controls similar to the new Speedlite 600EX-RT, including diverse flash metering options, and a number of flash modes, the Speedlite Transmitter ST-E3-RT makes complex lighting setups simple. With a compact design and highly reliable construction, combined with a clearly laid-out information panel and buttons with back lighting and more, the Speedlite Transmitter ST-E3-RT is an indispensible tool for advanced, professional flash photography.

NOTE: Because it does not have an optical transmission function, the Speedlite Transmitter ST-E3-RT is not compatible with earlier Speedlite models such as 580EX II.

Canon ST-E3-RT Features:

  • Newly-designed wireless system uses 2-way radio wave communication for enhanced communication among master and slave units
  • Achieves a transmission distance of up to 98.4 ft. (30 m), all at a 360° angle
  • Up to 5 groups, or 15 individual flashes can be controlled via 1 transmitter
  • Supports E-TTL II flash, manual flash, stroboscopic and auto external flash metering
  • Dot matrix LCD panel displays all pertinent information simultaneously and backlit control panel means easy operation
  • 8 types of custom functions, 3 types of personal functions
  • Improved hot shoe contacts for more reliable information transmission and operation; compact design is approx. 2.65" (w) x 2.42" (H) x 3.05" (D)

Canon ST-E3-RT Specifications:


  • Type: Radio transmissions wireless Speedlite transmitter
  • Compatible Cameras: Type A EOS cameras (E-TTL, II/E-TTL autoflash)
  • Sync Speed: High-speed sync provided (EOS-1D X and EOS 5D Mark III only)
  • Flash Exposure Confirmation: Flash exposure confirmation lamp lights ingreen
    *If it does not light, shooting is not performed with thestandard exposure
  • AF Assist Beam: n/a

Wireless Functions

  • Transmission System: Radio Transmission
  • Transmission Range: Approx. 98.4' (30m)
  • Flash Ratio Control: 1:8-1:1-8:1, power 1/2-stop increments
  • Flash Coverage: Transmission Angle: 360deg all around
  • Slave operation Confirmation:
    • Green Light:
      • Lit: Radio Transmissions okay
    • Red Light:
      • Lit: NotConnected
      • Blinking: Transmission Error/Too many units (Master units + slave units = more than 16 units)
    • Orange Light:
      • Lit: Sub-master transmission
      • Blinking: Receiving remote release shooting, linked shooting signal
  • Slave Unit SE Mode Cancellation: The test flash button can be pressed totest if the slave units fire or cancel the auto power off status.


  • Power Source:
    • AA/LRG Alkaline Batteris x2 (Ni-MH and Lithium batteries can also be used)
    • Battery Life: Approx. 10 hours continously (when using AA/LR6 alkaline batteries used [at a room temperature of 73°F/23°C])
  • SE Mode: Power off after 4 min. of idle operation
  • Dimensions(WxHxD): 2.65"x2.42"x3.05" (67.4x61.5x77.4mm)
  • Weight: 3.9oz. (110g)(excluding battery)

General Questions


Can I return a service part once it has been installed?


Installed service parts are non returnable, unless they are defective. All defective returns are exchange only - no money will be refunded.

To be the first to review this item, click here.

Add to Cart

We're sorry, only of this item available

Call a Sales Pro at 800-356-5844 for more information

© 2018 Full Compass Systems, LTD  9770 Silicon Prairie Parkway, Madison, WI 53593  All rights reserved.

We are not responsible for typographical errors in pricing or product specification
inaccuracies in our catalog or web site. Prices are subject to change without notice.