E-TTL II / E-TTL Autoflash, by Shooting Mode

E-TTL II or E-TTL autoflash suitable for the current shooting mode is used automatically – simply set the camera shooting mode to Shutter-priority AE (shutter-priority AE), Aperture-priority AE (aperture-priority AE), Flexible-priority AE (flexible-priority AE), or Manual exposure (manual exposure).

Shutter-priority AE

Select this mode when you want to set the shutter speed manually. The camera sets a suitable aperture value for the shutter speed to obtain standard exposure based on metering by the camera.

  • Aperture values blink to warn about underexposed or overexposed backgrounds. Adjust the shutter speed until the aperture value stops blinking.
Aperture-priority AE

Select this mode when you want to set the aperture value manually.

The camera sets a suitable shutter speed for the aperture value to obtain standard exposure based on metering by the camera.

  • Shooting with a tripod is recommended, because slow shutter speeds are used for low-light scenes.
  • Shutter speeds blink to warn about underexposed or overexposed backgrounds. Adjust the aperture value until the shutter speed stops blinking.
Flexible-priority AE

Any shutter speed or aperture value can be set.

  • If the aperture value blinks when you set a shutter speed, adjust the shutter speed until the aperture value stops blinking.
  • If the shutter speed blinks when you set an aperture value, adjust the aperture value until the shutter speed stops blinking.
Manual exposure

Select this mode if you want to set both the shutter speed and aperture value manually.

Light from the flash provides standard exposure for subjects. Background exposure varies depending on your specified shutter speed and aperture value.

Flash sync speed and aperture value, by shooting mode

Shutter Speed Aperture Value
Program AE Automatic (1/X sec.–1/60 sec.)*1 Auto
Shutter-priority AE Manual (1/X sec.–30 sec.) Auto
Aperture-priority AE Automatic (1/X sec.–1/60 sec.)*1 Manual
Flexible-priority AE Manual / automatic (at least 1/X sec.) Auto / Manual
Manual exposure Manual (1/X sec.–30 sec., Bulb) Manual

1/X sec. represents the camera's maximum flash sync shutter speed.

1: On cameras that support slow synchro, varies by settings.

Auto Zoom for Sensor Size

The Speedlite automatically recognizes the image sensor size of the EOS Digital camera and sets optimal flash coverage for the effective shooting angle of view of the lens in a focal length range of 24–105 mm.

Transmission of Color Temperature Information

This feature provides optimal white balance in flash photography by using color temperature information at the moment of firing, which is transmitted by the Speedlite to the EOS Digital camera. It is automatically enabled when camera white balance is set to Auto white balance, Auto (white priority), or Flash.

AF-Assist Beam

In conditions that make autofocusing difficult, such as focusing in low-light scenes, the flash fires continuously (intermittent flash firing mode) to assist in autofocusing. The AF-assist beam effective range is approx. 0.7–10 m at the center of the AF area.

Caution

  • Focusing with the AF-assist beam of an external Speedlite may be difficult when using a peripheral AF point on the camera, or when using wide-angle or telephoto lenses. In this case, use the center AF point or an AF point near the center.

Note

  • AF-assist beam firing can be disabled in C.Fn-08.
  • This beam may be emitted by the camera instead of by the Speedlite, depending on ambient brightness.

Check Firmware Version / Certification Logo

  1. Press the SUB MENU button.

  2. Display the information screen.

    • Turn the Select dial dial to select information, then press Select/Set.
    • Displays the firmware version (1) of the Speedlite.

  3. Open certification logo display.

    • Press Select/Set.
    • You can check some of the Speedlite's certification logos. Other certification logos can be found on the Speedlite body and packaging.