Customization with Custom Functions

C.Fn-00: Distance indicator display (Distance indicator display)

You can select meters or feet for the distance indicator display on the LCD panel.

  • 0: m (Meters (m))
  • 1: ft (Feet (ft))

Note

  • The right end of the effective flash range on the LCD panel changes to Right end when the effective flash distance exceeds 18 m / 60 ft.

C.Fn-01: Auto power off (Auto power off)

To conserve power, the Speedlite turns off automatically if left idle for approx. 90 sec., but this function can be disabled.

  • 0: ON
  • 1: OFF

Note

  • Auto power off takes effect in approx. 5 min. when the Speedlite is set as a sender in radio transmission wireless flash photography () or configured for linked shooting ().
  • When attached to a camera, the Speedlite turns off automatically if left idle for approx. 90 sec. after the camera has entered auto power off mode.
  • Setting [Auto power off] on the camera to [Disable] also disables it on the Speedlite.

C.Fn-03: FEB auto cancel (FEB auto cancel)

You can set whether to cancel FEB automatically after the three shots are taken for FEB.

  • 0: ON (Enabled)
  • 1: OFF (Disabled)

C.Fn-04: FEB sequence (FEB sequence)

You can change the FEB shooting sequence. 0: Standard exposure, –: Negative compensation (darker), and +: Positive compensation (brighter).

  • 0: 0 → – → +
  • 1: – → 0 → +

C.Fn-08: AF-assist beam firing (AF-assist beam firing)

  • 0: ON (Enabled)

  • 1: OFF (Disabled)

    Disables the Speedlite's AF-assist beam.

C.Fn-10: Receiver auto power off timer (Receiver auto power off timer)

You can change the time until auto power off takes effect when the Speedlite is set as a receiver in radio transmission wireless flash photography. Auto power off is displayed on the LCD panel when the receiver enters auto power off mode. Set this function for each receiver.

  • 0: 60 min.
  • 1: 10 min.

C.Fn-11: Receiver auto power off cancel (Receiver auto power off cancel)

Receivers that have entered auto power off mode in wireless flash photography can be turned on by pressing the sender test flash button.

You can change the time allowed for receivers in auto power off mode to accept this signal. Set this function for each receiver.

  • 0: 8 h (within 8 hr.)
  • 1: 1 h (within 1 hr.)

C.Fn-13: Flash exposure compensation setting (Flash exposure compensation setting)

  • 0: Button + dial (button + dial)

  • 1: Dial (Direct setting with dial)

    You can turn Select dial to set the amount of flash exposure compensation or the flash output directly, without first selecting Flash exposure compensation / flash output setting with the joystick.

C.Fn-18: MODELING LAMP (Modeling lamp activation)

You can select how the modeling lamp is activated.

  • 0: LAMP (button)
  • 1: Half-press shutter button twice (half-press shutter button twice)

Note

  • The LAMP button can still be used even with this setting set to [1].
  • Note that [Macro:Focusing lamp on/off] in camera menus refers to configuring modeling lamp activation.

C.Fn-19: FEM (FE memory)

You can select whether to update, based on ETTL flash output, the flash output maintained in manual mode.

  • 0: OFF
  • 1: ON
  • 2: ON / MODE ETTL/M

Note

  • Setting C.Fn-19 to [2] limits the modes available to ETTL and M when you press the joystick down and select MODE. To select another mode, push the joystick straight in to display the setting screen, press it vertically or horizontally or turn Select dial to select an item, then select the mode.
  • If you want to change settings in C.Fn-19 “FE memory” or clear all flash custom functions with [Shooting: External Speedlite control] in the camera menu, check whether your camera supports C.Fn-19 “FE memory”.

C.Fn-21: Light distribution (Light distribution)

You can change the Speedlite's light distribution (flash coverage) characteristics relative to the shooting angle of view when flash coverage is set to A (Auto).

  • 0: Standard (Standard)

    Optimal flash coverage for the shooting angle of view is set automatically.

  • 1: Guide number priority (Guide number priority)

    Effective when prioritizing flash output, although image edges are slightly darker than when set to [0]. Flash coverage is automatically set slightly more toward the telephoto end than the actual shooting angle of view. The display changes to Guide number priority.

  • 2: Light distribution priority (Light distribution priority)

    Effective when minimizing vignetting, although the flash range is slightly shorter than when set to [0]. Flash coverage is automatically set slightly more toward the wide-angle end than the actual shooting angle of view. The display changes to Light distribution priority.

C.Fn-22: LCD panel illumination (LCD panel illumination)

The LCD panel is illuminated in response to button or dial operations. You can change this illumination setting.

  • 0: 12 sec. (illuminated for 12 sec.)
  • 1: OFF (Disable panel illumination)
  • 2: ON (stays on)