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CMS-XML QuickGuide to Speedlite 600EX-RT Custom and Personal Settings
C .Fn-08 – AF- assist beam 0: ON (Enabled) 1: OFF (Disabled)
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 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 220EX Speedlite : How to use the AF-Assist Beam and what is its coverage
How to use the AF- Assist Beam and what is its coverage
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 Specifications of the 430EX Speedlite.
For high sync speed (EF flash): Approx. 2.3-39.4 ft./0.7-12m AF Assist Beam