Radio Transmission Wireless Flash Photography

Shooting with wireless lighting from multiple flash units is as easy as normal E-TTL II / E-TTL autoflash shooting when you use Canon Speedlites supporting radio transmission wireless flash photography.

The system is designed so that the settings of the EL-10 (sender) are automatically applied to wirelessly controlled Speedlites (receivers). This eliminates the need to operate receivers during shooting.

Positioning and Range

  • Autoflash with one receiver ()

    (1) RECEIVER EL-10

    (2) SENDER EL-10

    (3) Transmission range: Approx. 30 m / 98.4 ft.

  • Autoflash with groups of receivers (, )

    E-TTL II / E-TTL autoflash photography is possible with two or three receiver groups, and the flash ratio (proportion of flash output) can be adjusted as needed.

    (1) 2 groups (A, B)

    (2) 3 groups (A, B, C)


    • Take a few test shots in advance, and test flash firing ().
    • Transmission range may be shorter depending on factors such as Speedlite positioning, the surrounding environment, and weather conditions.


    • Set up receivers using the included mini stand.
  • Shooting in a different flash mode for each group ()

    This is only one example of flash mode settings.

    (1) E-TTL II

    (2) E-TTL II

    (3) Manual flash

    (4) Ceiling

    (5) Manual flash

    (6) Manual flash

Group Control

Firing group A

You can add receivers when more light or sophisticated lighting is needed. For added receivers, simply specify the firing group (A, B, or C) that you want to be brighter.

For example, when three receivers are set to firing group A, they are all controlled as a single, high-output Speedlite in group A.


  • To fire the three groups of A, B, and C, set to A:B C. Group C does not fire when Speedlites are set to A:B.
  • Aiming the units in firing group C directly at subjects may cause overexposure.


  • Flash ratios from 8:1 to 1:1 to 1:8 correspond to 3:1 to 1:1 to 1:3 (in 1/2-stop increments) as converted to number of stops.

Restrictions for Specific Cameras

Using a Speedlite other than the EL-10 as the sender may limit the functions available in radio transmission wireless flash photography. For details on available functions, refer to the instruction manual of the Speedlite used as the sender.