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)

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