Canon EOS50D EOS 50D Instruction Manual - Page 107
Using the Built-in Flash
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Using the Built-in Flash E-TTL II autoflash obtains high-precision and consistent flash shots. Using the Built-in Flash in the Basic Zone If necessary, the built-in flash will pop-up automatically in low-light or backlit conditions. (except in modes) Using the Built-in Flash in the Creative Zone Regardless of the light level, you can press the button to pop-up and fire the built-in flash whenever desired. If the built-in flash has popped up, you can push it back down with your fingers. d : For fully automatic flash photography. The shutter speed (1/ 250 sec. - 1/60 sec.) and aperture are set automatically. s : Enables you to set the desired shutter speed (1/ 250 sec. - 30 sec.). The flash exposure will be set automatically to match the aperture that was set automatically. f : Enables you to set the desired aperture. The flash exposure will be set automatically to match the aperture that was set. The shutter speed will be set automatically between 1/250 sec. 30 sec. to suit the scene's brightness. In low light, the main subject is exposed with the automatic flash, and the background is exposed with a slow shutter speed set automatically. Both the subject and background look properly exposed (automatic slow-speed flash sync). With slow shutter speeds, using a tripod is recommended. If you do not want a slow shutter speed to be used, set [8C.Fn I -7: Flash sync. speed in Av mode] to [1: 1/250-1/ 60sec. auto] or [2: 1/250sec. (fixed)] (p.175). a : You can set both the shutter speed (1/250 sec. - 30 sec., bulb) and aperture. The flash exposure will be set automatically to match the aperture that was set. The background exposure will vary depending on the shutter speed and aperture. 8 : The flash result will be the same as the mode. 107