771. Using EOS Dedicated SpeedlitesEOS dedicated Speedlites (540EZ, 430EZ, 420EZ, 300EZ, etc.) makeflash photography as simple as pointing and shooting. Moreover, built-inadvanced functions make it easy to achieve professional fill-in flasheffects in outdoor settings as well as automatic control of flash exposurewhen shooting at night or indoors. These units feature a built-in AF auxil-iary light function that assists autofocus in dark situations.By simply attaching an EOS Speedlite to the camera and turning it on, anappropriate flash synchronization speed (1/250 sec. or slower) is auto-matically set on the camera. As soon as the flash is charged, the flashcharge completion indicator appears in the viewfinder. For details, refer toyour speedlite’s instruction book.● Automatic Flash Output Reduction ControlWhen using a dedicated speedlite to take a photo of a subject lit by sky-light-type illumination, the camera automatically reduces the flash unit’slight output so as not to overexpose the subject.• The 540EZ's AF auxiliary light is designed to work with all five of the EOS-1 N’s focuspoints. Other EZ Speedlites' AF auxiliary light works with only the center focusing point.• The 480EG does not emit an AF auxiliary light.• The aperture values displayed on the camera and speedlite LCD panels may some-times differ. However, the exposure will be correct.• When using flash in AI Servo AF mode, the flash unit’s AF auxiliary light will not func-tion. In situations requiring use of the AF auxiliary light, switch to One-shot AF mode.You can turn off the automatic flash out-put reduction control function for strongly-backlit subjects which need extra illumi-nation from the flash.Custom Function(Refer to pages 90–91)00. Part.5 RS (E) (P.76~80) 27-01-2003 12:38 Page 77