Canon EOS 20D EOS 20D Instruction Manual - Page 92

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. d : For fully automatic flash photography. The shutter speed (1/ 60 sec. - 1/250 sec.) and aperture value are set automatically, just as in (Full Auto) mode. s : For when you want to set the shutter speed (30 sec. - 1/250 sec.). The camera then automatically sets the flash aperture value to provide the proper exposure for your shutter speed. f : For when you want to set the aperture value. The camera then automatically sets the shutter speed (30 sec. - 1/250 sec.) to provide the proper exposure for your aperture. Against dark backgrounds such as the night sky, slow-sync shooting will be set so that both the subject and background are exposed correctly. The main subject is exposed with the flash, and the background is exposured with a slow shutter speed. ¡ Because automatic slow-sync shooting uses a slow shutter speed, always use a tripod. ¡ If you do not want a slow shutter speed to be set, set C.Fn-03 [Flash sync speed in Av mode] to [1: 1/250sec. (fixed)]. (p.141) a : You can set both the shutter speed (bulb or 30 sec. - 1/250 sec.) and aperture value. The main subject is exposed properly by the flash. The background exposure varies depending on the shutter speed and aperture. 8 : The flash result will be the same as the mode. 92