Flash Photography497Flash Photography with the EOS-Dedicated 550EX SpeedliteFull Auto FlashThis section describes how to use Full Auto E-TTL flash with 〈 〉 (Program AE) mode. Forinstructions for operating the 500EX Speedlite, see the 550EX User’s Guide.1 Set the Mode Dial to 〈 〉.2 Make sure the 550EX Speedlite’spilot lamp is on.3 Focus the subject, and take thepicture. Make sure the flash-ready indicator 〈 〉 ison, and check the shutter speed andaperture value before taking the picture.Taking Flash Pictures in Each ShootingModeEven in 〈 〉, 〈 〉, and 〈 〉 modes, E-TTL autoflash is as easy as normal picture-taking without flash.(1) Press the shutter button down halfway to have the camera automatically set the shutterspeed or aperture value, just as in normal picture-taking without flash.(2) Press the shutter button down fully for E-TTL autoflash, using preflash evaluative meteringbased on the aperture value set in (1).(3) The background exposure is determined by the shutter speed and aperture value.MODE SELECPILOT HMode(Shutter-priority AE)(Aperture-priority AE)(Manual exposure)Shutter speed settingManual (30 to 1/200 sec.)Auto (30 to 1/200 sec.)Manual (30 to 1/200 sec.)Aperture (flash aperture) settingAutoManualManualYou can set the camera to apply a fixed shutter speed of 1/200 for flashphotography in aperture-priority AE mode. (C.Fn-6 126) Flash photography in 〈 〉 mode operates the same as in 〈 〉 mode. In the Easy Shooting zone (20), the 550EX Speedlite operates in Full Automode, with the same functions as the built-in flash.
