Canon 550EX - Manual (Page 118)

Specifications
Type: Direct-sync, shoe-mount flash with E-TTL/TTL autoflash control and
wireless transmission/reception (E-TTL preflash, AF-assist beam, auto
zoom, and bounce flash).
Type-A EOS cameras (for E-TTL autoflash control) See page 23.
Type-B EOS cameras (for TTL autoflash control) See page 77
Flash coverage and Guide No.:
See page 121.
Battery life and recycling time:
See page 11.
1.2 ms or less. For quick flash: 2.3 ms or shorter.
(1) Auto zoom head covers 24mm, 28mm, 35mm, 50mm, 70mm, 80mm,
and 105mm lens focal lengths automatically.
(2) Manual zoom: Enabled with zoom button.
(3) Wide panel: When the built-in wide panel covers the flash head, flash
coverage is extended for 17mm lens focal length.
(1) Normal flash
(2) Quick flash
(3) High-speed sync (FP flash)
(4) Stroboscopic flash: 41 flash frequency settings, 31 firing settings
(5) Preflash: Obtains exposure reading for E-TTL autoflash control
(6) Test flash: With test firing button
(7) Modeling flash: Fired with the EOS-3’s depth-of-field preview button
Compatible cameras:
Flash duration:
Flash coverage:
Flash modes:
Bounce positions:
Direction Angle Click Stops
Up 0“ - 90° 0°, 60°, 75°, 90°
Down 0°-7° 0°, 7°
Left 0°-180° 0°, 60°, 75°, 90°, 120°, 150°, 180°
Right 0° - 90° 0°, 60°, 75°, 90°
Exposure control modes: (1) E-TTL autoflash (with Type-A cameras: Preflash evaluative metering)
(2) FE lock (with Type-A cameras: Preflash metering, FE lock)
(3) TTL autoflash (with Type-B cameras: Off-the-film metering)
Flash exposure compensation:
(1) Automatic flash output reduction for fill flash.
(2) Flash exposure compensation adjustable manually with the Speedlite
up to ±3 stops in 1/3- or 1/2-stop increments.
(3) Flash exposure compensation adjustable manually up to ±3 stops in
1/3- or 1/2-stop increments with cameras equipped with flash exposure
compensation function.
FEB: Set with the Speedlite up to +/- 3 stops in 1/3-stop or 1/2-stop increments.
Flash range (with 50mm f/1.4 lens at ISO 100):
(1) With normal flash : 0.5 - 30 meters /1.6 -100 feet
(2) With quick flash : Min. 0.5 - 7.5 meters and max. 0.5-21 meters /
: Min. 1.6 - 25 feet and max. 1.6 - 70 feet
(3) With high-speed sync: 0.5 -15 meters /1.6-49 feet (at 1/250 sec.)
Flash exposure confirmation: Yellow-green pilot lamp lights.
Sync speed:
See page 124.
118