Wireless Transmitter

Canon Speedlite Transmitter ST-E3-RT (Ver.2) Specifications

Specifications

  • 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

  • Second curtain sync, 1/8192 power and FE memory for EL-1 and later Speedlites

Specifications in detail

Flash Modes

  • Auto Exposure Control
    E-TTL II / E-TTL
  • High Speed Sync (FP)
    Yes
  • Manual / Output Settings
    Yes - 1/1- 1/128 (1/81921, 2)
  • Manual Steps
    1/3 step
  • Strobe / Output Settings
    Yes - 1/4-1/128 (1/81923, 4)
  • Stroboscopic Frequency
    1-500Hz

Flash-Related Function

  • FE Lock
    Yes
  • FE Memory
    Yes5, 6
  • Flash Exposure Compensation
    Yes
  • Flash Exposure Bracketing
    Yes
  • Second-Curtain Flash Sync
    Yes7,8
  • Modelling Flash
    Yes

Wireless Flash

  • Transmitter
    Yes
  • Transmission Type
    Radio
  • Transmitter Range
    Indoors: 30m
    Outdoors: 30m
  • Receiver
    No
  • Number of Groups
    5 - A,B,C,D or E
  • Number of Channels
    15
  • Remote Shutter Release
    Yes

AF Assist

  • AF-Assist Beam
    No
  • Number of AF Points Supported
    -
  • AF-Assist Beam Type
    -

Power Source

  • Battery
    2 x AA batteries
  • Minimum Recycling Time
    N/A
  • External Power Supply
    No

Construction

  • Dust and Water Resistance
    Yes
  • Mounting Foot Material
    Metal

Miscellaneous

  • Custom Function
    8 (4 personal functions)
  • Flash Settings from Camera Menus
    Yes
  • External Flash Exposure Sensor
    No
  • PC Terminal
    No
  • Accessories (Included)
    Soft case
  • Accessories (Optional)
    Off-Camera Shoe Cord OC-E3, Release Cable SR-N3
  • Compatible Speedlites
    EL-1, 600EX II-RT, 600EX-RT, 430EX III-RT

Physical Specifications

  • Dimensions (W x H x D)
    67.4 x 61.5 x 77.4
  • Weight
    110g
  1. Compatible cameras may need the latest firmware update.
  2. Minimum flash output of 1/8192 possible with Speedlite EL-1 only (1/128 with high-speed sync). Does not show in the camera's UI settings on cameras launched before 2020.
  3. Compatible cameras may need the latest firmware update.
  4. Minimum flash output of 1/8192 possible with Speedlite EL-1 only (1/128 with high-speed sync). Does not show in the camera's UI settings on cameras launched before 2020.
  5. Compatible cameras may need the latest firmware update.
  6. Flash output amount may slightly differ between that of E-TTL autoflash and manual flash
  7. Compatible cameras may need the latest firmware update.
  8. With compatible cameras launched from 2020, e.g. EOS-1D X Mark III, EOS R5/R6 and later, but excluding EOS 850D.