Canon Speedlite Transmitter ST-E3-RT
 
Overview
Fire compatible Speedlite flashguns over distances of up to 30m. 
Radio-frequency control provides reliable operation even when direct line of 
sight is not possible.
Benefits
  - Radio frequency remote flash trigger 
  
- Fire selected Speedlites from 30m away 
  
- Part of the E-TTL II flash system 
  
- Controls up to 15 flashguns 
  
- Remote camera triggering 
  
- Weather sealed against dust and moisture.
Features
Take a look at a more detailed look into the Canon Speedlite Transmitter 
ST-E3-RT
Reliable off-camera flash control
Control compatible Canon Speedlite flashguns over distances up to 30m. 2.4GHz 
radio frequency triggering operates reliably, even when shooting outdoors and 
around corners - direct line of sight not required.
Multiple flash photography
Create intricate multi-flash lighting set ups, triggering up to 15 Speedlite 
flashes with a single camera-mounted Speedlite Transmitter ST-E3-RT. E-TTL II 
flash metering makes exposure control easy.
Remote camera control
Trigger an EOS camera fitted with a Speedlite Transmitter ST-E3-RT from a 
second unit or from a compatible Speedlite flashgun, such as the Speedlite 
600EX-RT. Up to 15 cameras can be triggered at once, for synchronised 
shooting.
Easy to use design
The Speedlite Transmitter ST-E3-RT is sealed against dust and moisture to the 
same degree as professional EOS cameras and L-series lenses. It features an easy 
to read back-lit LCD control screen and is powered by two AA/LR6 batteries.
Specifications
  
  
    | FLASH 
      MODES |  | 
  
    | Auto exposure 
      control | E-TTLII/E-TTL/TTL | 
  
    | High speed sync 
      (FP) | Yes | 
  
    | Manual / output 
      settings | Yes - 
      1/1-1/128 | 
  
    | Manual 
      steps | 1/3 
    step | 
  
    | Strobe / output 
      settings | Yes - 
      1/4-1/128 | 
  
    | Frequency | -500Hz | 
  
    |  |  | 
  
    | FLASH-RELATED 
      FUNCTION |  | 
  
    | FE 
    lock | Yes | 
  
    | Flash exposure 
      compensation | Yes | 
  
    | Flash exposure 
      bracketing | Yes | 
  
    | Second-curtain flash 
      sync | No | 
  
    | Modelling 
      flash | Yes | 
  
    | Colour temperature info 
      communication | No | 
  
    |  |  | 
  
    | WIRELESS 
      FLASH |  | 
  
    | Transmitter | Yes | 
  
    | Transmission 
      type | Radio | 
  
    | Transmitter Max range 
      approx. | Indoors: 
      30m  | 
  
    |  | Outdoors: 
      30m | 
  
    | Receiver | No | 
  
    | No. of 
      groups | 5 | 
  
    | No. of 
      channels | 15 | 
  
    | Remote Shutter 
      Release | Yes | 
  
    |  |  | 
  
    | AF 
      ASSIST |  | 
  
    | AF-assist 
      beam | No | 
  
    |  |  | 
  
    | POWER 
      SOURCE |  | 
  
    | Battery | 2 x AA 
      batteries | 
  
    | External power 
      supply |  | 
  
    |  | No | 
  
    | CONSTRUCTION |  | 
  
    | Dust and water 
      resistance | Yes | 
  
    | Mounting foot 
      material | Metal | 
  
    |  |  | 
  
    | MISC. |  | 
  
    | Custom 
      function | 8 (3 personal 
      functions) | 
  
    |  |  | 
  
    | PC 
      terminal |  | 
  
    | Compatible 
      accessories | SPEEDLITE 
      600EX-RT | 
  
    | Dedicated flash 
      bracket | No | 
  
    |  |  | 
  
    | DIMENSIONS & 
      WEIGHT |  | 
  
    | Size (W x H x D), 
      mm | 67.4 x 61.5 x 
      77.4 | 
  
    | Weight (Excluding 
      batteries), grams | 110g |