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CMS-XML 220EX Speedlite : How to use the AF-Assist Beam and what is its coverage
The Speedlite 220EX AF-Assist beam is emitted automatically to enable precise autofocus under dim light and low contrast conditions. The AF- Assist beam is effective from 1 to 5 meters (3.3 to 16.4 feet)
CMS-XML QuickGuide to Speedlite Transmitter ST-E3-RT Setup
5 . Confirm that the <LINK> lights on the sender and receivers are lit and green and that the AF- assist beam emitter on the receiver is blinking at 1-second intervals. Also confirm that the red pilot lamp (ready-light) on the ST-E3-RT is illuminated.
CMS-XML Reset C.Fn-5 is set to 0 (E-TTL).
With Type-A cameras, if C.Fn-05-1 is set, wireless autoflash shooting will not be possible If "AF- assist beam OFF" is set with the Speedlite or camera, the AF- assist beam will not be emitted. With Type-B cameras, even if C.Fn-05-0 is set, E-TTL II/E-TTL autoflash will not work
CMS-XML Explanation of AF assist beam operation
CMS-XML Specifications of the 550EX Speedlite.
Direct- sync, shoe-mount flash with E-TTL/TTL autoflash control and wireless transmission/reception (E-TTL preflash, AF- assist beam, auto zoom, and bounce flash). Compatible Cameras
CMS-XML MR-14EX : How to turn on the Focusing Lamps.
In low-light or when the viewfinder image gets darker at high magnification, it becomes difficult to achieve correct focus. In such cases, the focusing lamp can assist with focusing.
CMS-XML List of custom functions available on the 430EX Speedlite.
C.Fn-04 AF- assist beam OFF 0
CMS-XML The camera show E in Creative Zone when using the 580EX II
If "AF- assist beam 0FF" is set with the Speedlite or camera, the AF assist beam will not be emitted . With Type-B cameras, even if .Fn-05-0 is sat, E-TTL II / E-TTL autoflash will not work,
CMS-XML How to set and use the Custom Function Settings "C.Fn" on the 430EX II Speedlite
Custom Function Settings C.Fn-02-113: Convenient when you want to use the depth-of-field preview button to check the depth of field. C.Fn-08: If the Speedlite or camera's AF- assist beam is disabled, the AF- assist beam will not be emitted.
CMS-XML Specifications of the 430EX Speedlite.
For high sync speed (EF flash): Approx. 2.3-39.4 ft./0.7-12m AF Assist Beam