Canon EOS 1 Instruction Manual - Page 77

1. Using EOS Dedicated Speedlites EOS dedicated Speedlites (540EZ, 430EZ, 420EZ, 300EZ, etc.) make flash photography as simple as pointing and shooting. Moreover, built-in advanced functions make it easy to achieve professional fill-in flash effects in outdoor settings as well as automatic control of flash exposure when shooting at night or indoors. These units feature a built-in AF auxiliary light function that assists autofocus in dark situations. By simply attaching an EOS Speedlite to the camera and turning it on, an appropriate flash synchronization speed (1/250 sec. or slower) is automatically set on the camera. As soon as the flash is charged, the flash charge completion indicator appears in the viewfinder. For details, refer to your speedlite's instruction book. • The 540EZ's AF auxiliary light is designed to work with all five of the EOS-1 N's focus points. 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. ● Automatic Flash Output Reduction Control When using a dedicated speedlite to take a photo of a subject lit by skylight-type illumination, the camera automatically reduces the flash unit's light output so as not to overexpose the subject. Custom Function (Refer to pages 90-91) You can turn off the automatic flash output reduction control function for stronglybacklit subjects which need extra illumination from the flash. 77