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CMS-XML Reset C.Fn-5 is set to 0 (E-TTL).
Do not set it if you have an EOS Digital camera or the EOS Rebel T2/300 X . ... If "AF- assist beam OFF" is set with the Speedlite or camera, the AF- assist beam will not be emitted.
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 How to access Programs and Features (to uninstall programs) in Windows 8
On your keyboard, hold the windows key and press " X ". Click Programs and F
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 540EZ Speedlite : How to use M (Manual Expose) with TTL Autoflash with Type -B cameras.
Set the camera's shooting mode to manual exposure mode (M), then set the desired aperture value and a shutter speed between 30 sec. and the camera's X -sync speed. Make sure the TTL indicator is displayed in the flash unit's LCD panel
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.