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

Flash-Related Function

Wireless Flash

AF Assist

Power Source

Construction

Miscellaneous

Physical Specifications

  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.